Most releases will shoot off the string, just use an eliminator button between the string & arrow nock to keep it from pinching the nock at full draw.
Wingspan- (somebody correct me ifI screw this up) -with your arms stretched out place your hands & chestagainst a wall (give it a big-ole hug) and measure the distance from on hands finger tip to the other.
I never read exactly which fingers to use, index or middle- soI measure both ways- didn't make a big hill of beans difference (both still put me over 29") probably easier to use another person for this. I measured solo by placing one finger tip to the edge of a light switch cover plate and then kept in touch with the wall on the opposite hand long enough to mark it for measuringit with two free hands.

Not sure what's going on with the peep.

Try the tru-ball if you have money laying around, Basspro has it on sale right now (on-line).

Good luck with it.