Matt you're correct, I'm shooting the 3 finger version. The first two things I tried tonight to help out a little bit was lower my poundage so I wasn't straining to pull back 70 lbs with only 2 fingers on the release. The helped a lot already. Then I basically experimented with placement of my middle finger and found that for me the best thing to do seems to be to curl my finger up on top of the release while drawing and then lower it onto the release when I'm at full draw. I haven't shot this way yet, but just drawing the bow back it feels a lot better already.

I'll give it a few more shooting sessions before I drop the thing in the mail to you and go back to my index-finger caliper release.