Leviathan + Dagger vs Leviathan + Dagger

Last night, I had to fight 8 battles to climb from 14 to 1.  I won the coin toss 3 times at the start, my reaper never won me a second try. I feel like I should just force close as soon as the start first just to save time. 
my mods are all fine. 

Nothing is broken here. RNG is just RNG, sometimes it's very good to you, other times it flips every time and then there's the times it just beats you bloody.

You should start to write down every single battle and note what happened, you should notice after a decent amount of data points that it is in fact just random.
I've been noting down every battle since November 20th and have so far 32 logged mirrors.
I've gone first in 18 of those 32 attempts (56% win rate on coin flip) but what's also worth noting for this thread is that I had a spell a few days back where I went first 10 times in a row. Currently I'm on a streak of 4 lost flips, but it seems pretty even for me with my still limited data sample.

Also worth noting, out of those 32 mirrors, I've lost 1 due to timeout, the remaining 31 were wins. For the one loss I did have, I was playing while doing something else that got me distracted, so most likely if I had focused on the game I would have won as it was pretty close near the end, but anyway, my win rate is 97% so far.
I use the TIE reaper as 1st reinf mirror strategy, with fury, bomber, dagger starting and I do not have crazy relic levels on my pilots, so it should really be mostly a case of learning the mirror approach, play fast and then the main loss is the time you have to spend on these battles relative to how easy it used to be.

Yesterday, I was second in the first 5 battles in the fleet arena. Then I bought additional attempts to update the battles and was first twice.

Did the developers decide to look at the forum or was I lucky? In any case, the RNG is broken, since I was second again in TW and calling TIE Reaper did not help and the opponent's Leviathan ulted. And the developers do not allow me to replay the battle. Although they could have given it with the same composition.

Let me remind you that only 1 line in Dagger's skills will allow you to return to the diversity of Leviathan compositions.

GAC is tough just because there are really only 2 counters to Levi (mirror or Prof), but you really need to keep Levi against Executor Punishing One lineups now. So that means if your opponent sets Levi + Exec, you need to use Prof vs Levi and Levi (w/o MK6) vs Exec....and then hope your own defense of like Exec (P1) and Nego can stop what they have left....

he is serious, it does work well for Arena climb, but it's not exactly viable in GAC

You are speaking with purely anecdotal evidence and then complaining that others are doing the same. Even though the others, and I, are providing you with real numbers. And it's not just today.  And 7 of 8 is an actual sample size.  Go flip a coin and tell me how many times you get 7/8 in one direction.

It's fine though, I'm going to start keeping track, maybe I'm wrong, I'll find out.

I agree and would like to add a few things.

1. I don't mind the 50/50 chance on who goes first. If I go first, great. If the enemy ship goes first, it happens. What bugs me is that the current Levi mirrors are too dependent on who goes first. If you go first, you can put it on auto for most of the battle. If you go second, you're doomed. Even with the Reaper strategy, it's still too RNG dependent. Even if you go first the following two turns, the enemy reaching the Ult is game over for you.
2. If the enemy Levi uses the Ult, each time a reinforcement shows up, two of your ships are stunned instead of just one. Aside from that, each time the enemy Mk6 shows up, it immediately uses its basic and nukes one of your ships, meanwhile your Mk6, if you for any reason have the battle on auto, just keeps using its specials and wasting time. Also, once the enemy SFighter, multiple ships end up gaining Foresight, not just the ship(s) that have attacked - e.g., the enemy Dagger attacks, both the Dagger and the Fighter get Foresight.
3. Unless I'm mistaken, this is supposed to be a game and we're supposed to be players enjoying said game. This isn't a murder trial. I understand accusing someone of cheating, it could get the other player in trouble if it ends up being a misunderstanding, so some kind of solid proof is necessary. I can understand warnings against deliberately rude or offensive language, be it in the forums or the game itself. I also understand if it's a noticeable bug that hasn't occured before or in other game modes, like Gungans not being immune to Protection Disruption in the Naboo Raid, it's advisable to post a screenshot. But we should be able to voice our opinions on whether something seems unfair or different without having each word shut down at best or scrutinized at worst. If we end up being wrong, we're wrong. But if we feel the Naboo raid, for example, is more difficult than usual because of the incessant RNG, or if we feel that the enemy Levi is going first far too often, we should be able to speak without having to back it up with cold hard data. I repeat, we're players. Not developers or detectives or lawyers or whatever else.

The mirror itself is not that bad, but there’s 2 things that’s beyond stupid.

1. leviathan’s literally useless ult. So I have half the enemy ships on yellow hp, I ult and instead of screwing them up even further THEY HEAL TO FULL HP! Who’s the “genius” that made and tested this bs? The ult should AT LEAST put non removable heal block on all enemy ships. 
   
   
2. 2) and with all said above there’s the 2nd problem - the time. Usually ult on any side happens around 2 min 30 sec mark +/- 10 secs. So you have 2 and a half mins to destroy usually 4 ships that can both heal and auto remove debuffs. Not even mentioning MK6 restoring himself. 

Profundity vs Leviathan? Are you serious? But more often there are situations where there are 5 Sith ships with Foresight.
That's why I write that the developers don't want to fix their own game because they don't play their own game. Or they play on a test server where they put up G1 opponents with 1 star.

And so the GAC began. And since the developers never fixed Leviathan, I'll have to write here again and again. After all, the developers deliberately broke the meta-fleet so that it couldn't win in mirror matches in 99%.
We broke the fleet so that they would bring us more money. - such is the motto of the developers who don't know their game as well as we, the players, know all its subtleties.
I'll repeat myself. By adding just 1 line to Dagger's abilities, we can fix this malfunction. But the developers don't need it.
Yesterday I lost 4/5 matches again. And all because of the broken RNG, which the developers do not want to fix.