Maybe try some 44 special loads at 25yds to eliminate most of the recoil.
I have noticed in my SBH that I have to be consistent with my hold/grip. Otherwise, my grips do open up. My revolver likes 180XTPs and Bullseye for 44sp and 265gr GC slugs and H110 for 44mag. 1" 6-shot groups at 25yds with iron sights.