What level of cant are you speaking of? Is it past maybe 2:30 (o'clock). What is your brace height at? You really want to eliminte as much slap as possible. Your grip, stance (you may have to open it) andbow arm extension can also come into play. If you have not done this before, try griping a door jam as you would your bow, now without moving your grip, move your elbow up by rotating your shoulder.

Lining up the arrow below your pupil is a very important thing. However, you can also acheive this (besides canting the bow) withslight variations of head lean (people usually lean their heads at the same level of cant, but others use variations), and variations of anchor points (not everyones head is exactly the same, you may have to anchor to a different upper tooth).