Before I get into nock pinch or torque , your not guiding the arrow with your left forefinger while drawing are you?

What kind of rest are you using?

Without watching you draw I'm gonna take your word for it and assume you can draw it back with ease. You can try lowering the poundage to see if you still have the problem. What do you have to lose? Your not less of a man if you have to shoot 50#

Without seeing your actual setup (how your loop is tied , etc.) it's hard for me to determine what the actual problem is. But nine times out of ten that problem is caused by torque or nock pinch. When drawing make sure your drawing hand stays in line with your bow hand.

Do me a favor , go to the range as soon as you get a chance and turn your poundage down to 50# and try shooting for awhile. Then report back and let me know if there was a difference.