> but after a few seconds i peel off the hanging half. or even sometimes “even out” one finger with a longer nail to match one with a smaller nail (since i bit that one.)
I used to have a similar problem. Part of the obsession is ensuring the nails are about the same length. Here’s what I did, it may work for you:
Try your very hardest not to bite them for one day. Then cut them with proper nail cutters (not scissors). Your nails with be smooth and even for the first time in ages! When you next bite them, notice how they won’t ever be as even as the cut nails, so don’t bite then quite so deep and then recut them with nail cutters. Hopefully, you will find as I did that nail cutters leave them much more even than teeth and biting only ruins the symmetry rather than helping.
Best of luck!