Originally Posted by
TFOX
The problem started with the loop.My bet is it made him stretch out too much too be accurate with.This has changed anchor as well as overall draw length.If he does better without the loop,remove it.
Remember the release made things longer as well as the loop.You have in effect,lengthened his draw length by an 1" or more.
That's probably it. Try Tfox's idea. It works you may still be able to shoot with a loop if you make it as small as possible and use a shorter style release.