Balls are not problem shedders. All snakes will shed wonderfully when their husbandry is correct. Poor sheds is a sign of incorrect husbandry.
As for tips. I say use the search feature. This is a common thread and you can find tons of ideas on how to improve your husbandry.
For specific ideas a picture or at least a detailed description of your setup would help. Without knowing what your using and what you have we would be shooting into the dark.