add right lateral pitch to all the 3 holes, in one taiwan site, they described one famous helicopter bowler use middle 3/8 right lateral, ring 3/4 right, no forward and reverse, thumb use 3/8 right lateral and 3/8 reverse, anyway, it is only a reference and you need to try out your reverse pitch on thumb, usually, the helicopter play with semi finger and not fully insert their thumb into the thumb hole.
