To be perfectly honest, I may not know as much as some people about this game, but I do know that you have a pretty bad arena team.
Pretty much, SBBs don't matter in arena as most fights are over with a single BB volley. But with one of your units being a healer, and another having a single target BB, it only means you have at MOST 3 chances for an instant win. Right off the bat you cut your chances at winning almost in half.
The first thing you should do is remove Shera and Ulkina from your team, they are NOT arena units. You want units with fast charging, AoE damage BBs in the arena, because most times it only takes one BB to pull off a victory. I'm sure others can go into detail about the other units and the right spheres to use, but at the very least, swapping the healer and the mitigator for offensive AoE BBers will instantly boost your win rate noticeably.
Also, all units have specific Arena AI types. Meaning each unit has it's own triggers and flags for what will cause it to use it's brave burst more often. It's best to get familiar with these types and arrange your team accordingly, because squad order *does* help in the arena.
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