Actually, that pointed triangular look is what a normal wild ball python looks like. This is their natural shape. The ones that we have in captivity tend to look round because they are fed very well. Maybe a little too well sometimes.
For shedding issues, I've found that a humid hide (the one on the warm side) works well. Just a plastic box, (shoe box, sweater box, whatever is the appropriate size) half filled with damp (but not soaking wet) sphagnum moss will pretty much take care of shedding issues. You really don't have to worry about the percentage of humidity.