I can't help you with the back tension thing, I don't shoot one. I am thinking of getting one this comming week though. If you don't get any answeres here, try this site archerytalk.com . Lots of target shooters there, most use backtension releases. You could also look at the book Idiot Proof Archery, it goes pretty in depth about it. I just skimmed over that part though since I use a trigger, but I will be re-reading it.

Good luck,
Paul