Guess I should say that I'm currently 1/4 low.I started 1/4 high like the Easton manual suggests. I've been all over the place with it though now... lower... higher.
Regarding nock pinch, I don't think it's pinched. But, I haven't been using serving between the loop and the nock. Instead, I've been taking the bow away from my face a bit periodically and visually inspecting to make sure it's not tight. I know this isn't optimal but I've been moving my d-loop so much, tying serving has become a pain.