After some serious experimenting with AP and RX mods, I have determined that my left hand is the weak link in my plays. I have found that at 4 star difficulty, I can get 99% FCs with only my right hand, but only using my left hand I fail the map several times over. The only logical way to fix this is to train my left hand to be better at it's job. My only question to you folks is, what should I do to train?