Ok to use bib hanger for manual stretching

Earlier I posted about my wrist hurting after doing manual stretches

Today I put on the bib hanger.

It really worked well when I did the side positions.got a very strong grip and was in total control

Downward didnt feel it that much for some reason.

Upward didnt work at all, as the skin enveloped the head

Any tips/thoughts/comments? The instructions always say to make an “ok” grip, is there any problem with the bib hanger covering the vast majority of the penis?