I've been working on fine tuning my finger control to increase speed and finesse. Here is the problem. My stick rotates in my left hand. It does not move forward or backwards, just rotates. The problem is it rotates then seems to roll to the tip of my thumb, which causes me to stop and re-grip. Visually, my grip looks identical in both hands. Yes, my left is weaker, but I feel like I'm holding both sticks with equal pressure. How might I stop that rotation and roll?