If you want more negative effects go for HK-47 (at max) his grenade has a 25% chance each to do offense down, defence down, speed down, and ability block and with his lv70+ upgrade to it the attack will also gain a 50% chance to do DoT and all of these odds are doubled against Jedi. The other main I'd suggest is old Daka with a (again maxed) 60% chance to stun the target and a 55% chance to stun another while providing a healer/reviver and not to mention both characters are dark side to help with those battles as well
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Thanks a bunch for the advise. I real appreciate it.