When you move your Heel/Toe shifter, is the Shaft moving with it? Are your shifter lever pinch bolts aligned in their rounded groove? Are your shift levers loose on the shaft, or tight?
I would suggest taking both of the shift levers (Heel & Toe) off. You have to completely remove the 1/4" allen head bolts, not just loosen them. Then, check the movement of the grooved shaft, by moving the forward shift lever (next to the front cylinder). Try to remember, or "MARK" the levers position on the grooved shaft, for correct re-assembly.