I know the KC tree is for tanking and Infil for stealth and burst DPS, but what on earth is Balance for?

Had the same problem. Turn all settings to high, then turn them all back low. My game runs excellently now.

http://www.torhead.com/skill-calc#801Zrsrbobc0zZcIMbkG.1 I went up Tactics and Assault. I've layered everything so that my overall DPS is improved, I get stat buffs, and my HIC and Plasma cell is over the top. Suggestions?