Need to get your temps and humidity right. Warm end should be 92 deg F, cool end about 80 - 82 deg F. My BPs humidity is usually around 50 - 55% when they're not in shed. As soon as I see them going into shed I whack the humidity up which is easy to do. I put an extra water dish in the warm end right under the ceramic heat lamp and spray the inside of the viv about 3 or 4 times a day with a plant mister (cheap and cheerful and works well). Apart from my adopted rescue BP, Bobby who was in a bit of a state when I first got him and I had to help him with his shed the first time he shed with us, I don't have any problems with either BP. The last shed Bobby had, he managed himself - all off in one piece, eyecaps included. As soon as they've shed, I allow the humidity to come back down to 50 - 55%. A lot of it also depends on your climate. Over here in the UK it can vary from day to day and even hour to hour! If you haven't got one, get a humidity gauge. They're fairly cheap to buy. I think you can get them at Walmart over there for under £5 ($9 ?).
Hope this helps.