i normally clamp for about 10 minutes. the instance where i noticed the shape change, i was in for about 20. i felt pretty comfortable with it til i noticed i was starting to look a bit triangular.

i clamp tight too. do you think i'd have more luck looser? or should i just stick to 10 min? both? after a year or so of pe, girth has been giving me trouble, so i'm a little eager.