No. I think what's happening is you are mashing the trigger a bit with the heavier loads. You're finessing the trigger with the light wadcutter loads. Try a lot of dry firing. Two good tricks are alternating the two rounds in the cylinder, and alternating the heavier rounds with empty cylinders. Practice. I think the problem is nothing more than trigger control.
If you want to shoot...shoot...don't talk! Tuco
USAF Munitions 1969-1992