TC, I too feel the loop would take a bit out of the draw length but not a big enough deal to be concerned with. I used a string loop on the compounds I used to shoot, thing is I always had mine very short in comparisons to others, just enough to snap on the jaws. I always would finger nail polish or flecth tite the string loop part itself & that would make it stiff as wire, it was quick & easy to get the release on without looking at the loop with practice.
Too, I feel I would be way less apt to short drawing with a release than fingers, this is especially so during crunch time hunting! Nothing written in stone yet but will try a few out for the fun of it. (grin) I feel with a cleaner release I'll add speed, penetration & great arrow flight, it should give me the best my bow has to offer & that instills confidence! These are very important to me on a hunting rig setup! Good Luck guys!
ElkNut1