IMHO this is the most overlooked item in bow tuning. If you nocks are too tight on the string this could cause some slight fishtailing. You should be able to push your arrow off of the string with just a slight amount of pressure from your thumbnail.
I had the same issue. I tried tuning (walk back and paper). I played with arrow spine, and draw weight and could never get the left lean out. I then changed my nocks to Bohning double lock nocks and problem solved.
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