A suggestion I'd make is to not buy a bow that is drawlength specific. If you have one that has a rotating module then you can always adjust it to your "feel".

Adding a loop or using different releases does not change the drawlength of the bow. It only changes your body parts as you anchor. You take a bow that is set up right for you and then add a loop. It makes you stretch out a little more, which usually isn't good. You can compensate for this a little by shortening the drawlength of the bow about 1/2"---if you have a bow that is adjustable.

You can also help compensate by adjusting the strap on the release, making it shorter. Things can be done. But when you make some of these changes you have to give your body time to adjust to the new "feel". It's not a matter of a few shots or even a hundred. Give it several hundred shots. If you shoot 30 arrows a day then give it three weeks.

FYI, I think you meant wingspan divided by 2.5 In any case, although this isn't always right on it's a lot better than taking some guess. And as I said, a bow that is adjustable always helps, too.