Zader Heroic Rancor HELP.

I just checked your mods on swgoh.gg. You have plenty room for improvement still. You can speed your Vader up even more, f.ex. by giving him a diamond mond with speed secondary. You can improve his dmg by giving him an offense cross instead of his current potency cross. You can improve TFP's chance to inflict tenacity down by giving it a crit chance triangle. All this will also improve your performance in arena. Under zEP lead you would want your Vader as fast as possible. Furthermore he doesn't need potency unless fighting opponents with in excess of 15% tenacity more than his potency (after calculating any bonus from EP lead).