RE: Fore Arm Slap
In my humble opinion try this suggestion. My guess is your standing to square to the target or past square or 90 degrees to it. You need to open up your posture possibly. Lay an arrow on the ground pointing at the target and put your toes against the arrow. Your feet should be a shoulders length apart and your shoulders the same line as your feet. Now bring back your front foot about half a step away from the arrow leaving your back foot against the arrow. You now are more open in posture and could possibly stop the string slapping your forearm. Try shooting from this posture for awhile. Good luck.