I have a lot of options at the moment. I use Sid, Lumi and Dooku mostly. I'm thinking of going Hindering Press to 7 (+10% multi) but wanted some advice, cause I can only pick one now. I'm level 67 btw. A lot of these are just boring +5% damage upgrades. In arena I usually use Phas (L) Lumi GS Dooku and Sid
Sid 7*
Deathstroke 5 -> 6
Demoralizing Blows 6->7
Lumi 7*
Flow of the Force 4->5
GS 4*
Aggressive Advance 3->4
Hive Tactics 5->6
Dooku 4*
Hindering Press 6->7
Force Lightning 5->6
Poe 4*
Challenging Shot 3->4
Resistance Bravado 5->6
Stand Firm 5->6
Phasma 4*
Onslaught 4->5
Victory March 5->6
Fullisade 5->6
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Replies
Focus on specific characters you want to max and try to stay focused.