Make The Executrix's Ultimate Unavoidable.

Even if made unavoidable - you still need to get the enemy down to the 2-3 ship range. A 5 ships the damage is insignificant. At four ships it might show, but if you're down (because of Akbar's extra attacks) it's not going to change the tide.

At three ships, if you're down to 2, it's random, but now it'll turn the battle. (2 or less and the Executrix is aptly named)

I know one guy keeps popping on here and saying he managed to stay in the #1 spot with the Trkin... but 95% of people are playing Akbar for a reason. The extra attacks utterly destroy a target locked ships and wreaks a heavy toll on the Mace-Kloon-Taunt-Dance. The debuff cleanse ruins the extra damage for Tarkin and removes target lock in general. If Mace keeps count his ultimate stops Tarkin's ultimate completely.

And, really, there is only one Imperial ship us mortals can get right now.

TBH, I keep Tarkin shadowing Mace in terms of levels (which is affecting my power, I know) in the hope they do something.

Having fought both admirals with a few configurations and strategy Tarkin is just "up all night trying to get lucky"