Also, are you soaking your snake before he sheds? That's actually a bad thing, as it pulls natural oils out of the skin that help them shed, and can make a shed go badly. One should only soak after a bad shed to help remove it.
I have never heard this before, do you have a source?
Personal experience, several friends who own snakes, people on this forum and other forums....The general idea goes that they had a bad shedder or thought that you should soak before a shed, they bumped up humidity AND soaked the snake and still had bad sheds. Next time around they ONLY increase humidity and do not soak, and the shed goes just fine.