The way I increase humidity for great sheds is to put the water dish over the heat source (Under tank heat) right as the snake goes blue and then leave it there until it sheds. Wendy is dead on, ditch the overhead bulb heating. Creates an extremely dry environment. 92-95 is fine. I have never heard of snake oil, but would never trust something that has the same name as is given to magic potions that do nothing.

Jamie