I've found that I shoot my best when I cant my bow to match the natural hand position of my left hand pointing at an object. From this position the arrow falls in line under my dominant right eye, and my misses are usually up and down. Anything other than this cant results in left and right misses.

But I've also found that this level of cant introduces a tendency for arm slap. It's bad enough right now shooting bare arm, so I know it needs correcting before I slap on the cold weather duds.

I know overdrawing is a usual culprit, but that's not the case here. I think it's from the cant bringing the bottom of the string closer to my arm. Is this a common problem with trad bows? How is best countered/corrected?