there are a couple schools of thought. push and pull seems to work pretty good w/ triggers, but i can now shoot an index trigger w/ back tension w/out pushing or pulling. i'd say that 99% of the time the issue, no matter which school you come from, is that you've got the wrong muscles tight. you have to learn to relax everything you're not using. you also have to have the bow fit you just right. if you're chicken-winging your release arm you're too short, and if you've gone past the line of your arrow w/ your release elbow you're long. your neck needs to be straight up and relaxed. if that muscle that goes down the right side of your neck is tight from tilting your head - back tension doesn't work. it needs a clear and relaxed line of travel to your rhomboid - or your rhomboid won't work. check your tricep for tension, and your forearm, and your fingers, and your shoulder. tension in them inhibits back tension. if you can get a little bit of a feeling like you're hanging when you're at full draw - that's the right place to start executing your shot.

i guess in one school you load up tension on the system and pull thru it, and in the other there is no added tension to the system at all.

if there's any way you could get w/ someone from any of the schools of thought, who's good at it, i think it would help you a lot.