One of my SRs, when I use it seems to not evenly/fully effective remove hair. It's the one I didn't actually set myself, but it looked pretty good and I just touched it up. It doesn't tug or pull or anything when I use it, but I seem to end up with patches of not fully cut hair. Could it be that the bevel is not even? What would be the best approach? Reset it? Or work down grits first?