A rock spinning too fast will melt more ice in front of the stones path reducing friction and lubing the ice in front and possibly pulling water over to the ins

A rock spinning too fast will melt more ice in front of the stones path reducing friction and lubing the ice in front and possibly pulling water over to the inside curl side leading it to fall forward more and catch less on the curl side. P.S. This is just my speculation, not from physics but from being a curler.