Your droid team should be able to hit top 10 honestly. What's holding you back is mods. 86 needs a crit damage triangle and complete crit damage set. HK (and really 88) needs a potency cross. You need to get all your mods to level 15. You need a crit chance set on 88. You are missing two mods on B2. And numerous other mod issues are holding you back.
Also, a general strat that most people miss out on in arena, if you can spend 50 crystals for a refresh in attempts, and that will cause you to jump two prize tiers, for example right now you are in the 20-50 bracket and if you could buy a refresh and get into the 6-10 bracket, you absolutely should because you will net 50 extra crystals.