RE: backtension release
There must be at least as many ways to shoot a BT release as there are archers using them.
There are several general ways are based on the amount of travel required before it goes off.
Some guyslike a lot of travel so thatthey get a very strong shot. Getting it to go off with a lot of travel requires some hand twist.
Others set the release with little travelso thatit will go off with justrhomboid movement, keeping the hand as relaxed as possible.
Others are in between and set the travel so that rhomboid movement is complimented with a slow relaxation of the index finger.
You can be accurate with any of these if you practice enough.
My personal preference is the third one I listed. George Ryals taught me this and it seems to work the best for me. I've tried the other ways and just can't get comfortable with them. Moderate travel, firm anchor, elbow moving straight back in line with the arrow is the easiest way for me to shoot a relaxed and smooth shot.
Everybody is different, so what works for me may not work for you.