A fair grand arena match...?

I think I've found the problem. You're roster really isn't that dissimilar to mine, slightly more advanced in some areas, slightly less in others. The difference is, as usual, in mods. You seriously lack the speed required, and don't have set on to compliment the characters you have. For instance your JKR probably hits like a truck, but you want him to be the fastest on the field, not with 18 speed added to him. My recommendation would be to start throwing crystals at mods rather than gear, because that is genuinely such an important factor, and it allows you to have good mods with sets that fit, whereas if you were to just speed up Revan as much as possible, he would lose all those other bonuses. Get mods as much as possible, upgrade them, if they have speed, keep them, if not sell them, only buy them from the store if they are exactly what you are looking for, that sort of thing. it's not fun, but it's necessary, and very effective, speed is king in this game.