Keep in mind that the arrow flexes when you loose it. You'd be surprised how little it actually touches the riser of the bow as it leaves. It's likely quite unnecessary to completelt eliminate all the little node bumps.
Take a look at this slow motion video. If you've never seen this it can be quite a revelation.
http://www.youtube.com/watch?v=96KGWC0PB6s&list=TLZUlDXn_25A8
Guy
Sherwood Shafttamer:
http://www.archers-review.com/images/109.jpg
Ace Roll-R-Straight:
http://www.acearcherytackle.com/tools.php
Guy