Have you ried shooting it without a grip?
That was my favorite answer to the grip problem with some of my bows while I was having recurrent torquing prolems in the past. Liked it during summer practicing, but whenthe temps dropped, needed either a glove or a wooden/rubber grip. Shot a coupleof then with no grips and just used a glove when needed in colder weather. A cloth or leather glove works best, you DON'T want one with the rubber "gripping dots" built in! eliminating any friction between hand and riser is the best torque reducer possible.