I think I might be stretching wrong because right on the rim of my head and underneath get rough after I stretch and usually hurts. This obviously has an impact on how hard I can stretch. I think the problem is in the way I grip. I use an average OK grip. I've noticed that my thumb and forefinger puts stress on the sides and the curve btwn my thumb and forefinger rubs on the top. The skin around my head where the stress hits it seems to callus. This reduces my sensitivity and decreased the amount of pressure I can pull on my next stretch session. Now if I put lotion on it the rough spots usually go away in a couple of days but that would mean doin a 1-2 day on and 2 days off cycle. Any Suggestions