Good advice. I agree that everything you are seeing shows that your humidity is too low. If you have two heat lamps and a screen top, it will be impossible to get the humidity to where BPs need it. You can get it there with one heat lamp and a UTH with the screen covered with foil or a wet towel. Best option in my book would be just switching to a tub setup which is cheap and easy (and there is a guide in the husbandry forum).