ORIGINAL: Rangeball
I'm having a hard time visualizing how the string is hitting your left shoulder. I also have an ASAT 3D leafy suit (which is phenomenal) and have never had a problem hitting that area, it's pretty far away from the string's path.
Perhaps it points to a form issue? Can you try rotating your left elbow out away from the bow at full draw?
However, if you you're shooting good, I'd just leave the suit at home this close to the hunt. Work on form later.
Now that you mention it, it's more likely that it's catching the "leaves" on my chest. All I know is that I hear the popping sound of the string whipping the leaves when I release.