Well I got my homeboy teaching me how to make my left hand stronger. Carlito knows my homeboy Ben Ross. Anyway, dude has me practicing grooves and every 4 measures I switch hands on the hi hat. So I will do for measures with my left hand on hi hat, then switch to right, and back again. My left arm was killing me after so it's a clear sign that I don't use it that much and my technique sucks in the left.