cajun,
Helping with something like this really needs face to face work. Do you still have the first joint from the tip of the middle finger? Is it still movable? If so, MAYBE you can still do a deep hook. BUT!! That is speculation and guessing on my part with out seeing -- in person. All you can really do is to try it out and see.
Many times, the string or tab hitting the face is caused by the shooter laying the head over to the string/string hand at full draw/anchor. That movement turns the head a little into the string and can cause the problem.
3 Under verses split is an ongoing discussion. IMO, there should be NO difference in releasing either way -- no change in the mechanics of the shot. I know, many feel or believe one is different from the other. To me, a string hook is a string hook and it really doesn't matter -- again for the shot. It DOES change aiming parameters so depending on what you are doing one MAY be better than the other -- for AIMING.
Arne