ORIGINAL: Roskoe
You don't really extend your draw with a string loop - at least if you use a kisser button or anchor to the tip of your nose, as I do. You just change your anchor position to maybe a little further back on your jaw.
Which means you have extended your draw length.Your hand is further back giving you less strength and less back pressure from the bow to hold it stable AND when you move your anchor back,you may be overrotating the release hand elbow.You may even move off any solid anchor.
You will not lose 3/4" draw length,you will need to shorten it more like 3/8" to 1/2" if tied correctly,then you will have to adjust your anchor up SLIGHTLY to get the string back across the corner of your mouth and on the tip of your nose.
The eliminator button is probably your best bet because if I remember correctly,you don't have draw length adjustment on your cams.
Didn't you say they removed the stop pegs? If so,you could put the stop peg in the 65% letoff hole and put a short loop.Then get arelease that is designed for a loop and probably be in way better shape than you are now.
That shop should never have put the nocksets on like that,that will definately cause problems.