I recently experimented with a different anchor. I shoot three under and normaly use my middle finger to corner of mouth but i tried pointer finger to corner and it feels very comfortabke but i keep throwin arrows to the left any idea why that is i havent changed anything else.
These are common reasons for throwing an arrow to the left for a RH shooter (other than equipment related reasons):
1. Arrow is to the outside of your dominant eye, rather than directly under it.
2. You are torqueing the bow or the string or both.
3. You are not getting your elbow behind the arrow at full draw, so you are "pulling" the arrow to the left.
If none of those ring a bell for you, then I suggest you make a video and post it here so Arne or one of our other resident experts can give you better advice.