As uncut, the skin was so long that the up/down movement did not sollicit any tightness on skin, it just slided up/down. When I was semi, on the upstroke, it would stretch the skin and that provided sensations. Now that i am really cut, the skin tightness is great and as I rub the skin, this is a new sensation that I didn't really have before (unless I manually "locked" the skin down tight with the other hand).............
I also find that rubbing the inner foreskin directly provides far more stimulation than when i was uncut where I was not realy aware the inner foreskin was sensitive since I never rubbed it.