I am on a late March server (with players just now hitting level 80), but have had pretty good success so far with my all Jedi squad. The problem most people don't realize is that Jedi teams are not going to be thrown together like other teams where you throw a taunting tank or two in front of some high DPS characters. So, I wouldn't take advice from people who have that team in the arena and then tell you what would work in theory for Jedi--we don't have those kind of characters.
In actuality, Jedi need a lot of help in the arena with speed, offense, defense, dodge, and tenacity (to battle those nasty anti-Jedi). Which, initially, looks a little depressing. But, from someone who can still take #1 in the arena a couple times a week, there is hope. You need to really pick the best team, not just the best individual characters and you can find some good success. Here's how I do it:
QGJ (L) for team speed and offense up
IMD for team defense up (and help with those nasty droids)
Old Ben to lower the team offense and special ability of your opponents
Yoda for team tenacity up and dodge (via Battle Meditation)
Luminar for team healing over time
Now, you might be tempted to say "Ahsoka can self heal," or, "Mace can do more damage with expose." But, there is where you would go wrong. They serve themselves better, but not the team. You need to play Jedi, not as individual characters, but as a team. I think this is where the whale went wrong by using Aayla and Anakin. They are too selfish to play on a Jedi team. You need group contributors and you will be more successful.
I know I am not on a mature server, but so far this works for me and usually keeps me in the top 10 at payout with the not so uncommon #1 spot, and rarely falling below 30.
Oh, and just in case you were wondering...I did try an IGD lead, but without his omega, I have had better luck with QGJ lead. This gets Old Ben's Mind Tricks off earlier, which is a greater benefit at the start than counters later on. I look forward to seeing if the 25% counter damage boost helps with the omega.