My snake is also about 20 inches long and he has a real problem getting rid of his right eye cap. He actually has a problem getting rid of the skin on his entire head. I have tried soaking him and I have even gone as far as to take a piece of tape and lightly touch the cap, but nothing works. I have read that their eyes are sensitive so I havn't tried too hard to physically remove the cap for fear of damaging his eyesight. My temps are 91-81 and the humidity is 50-60%, and before and during the shed I bump it up to 70%. He sheds his entire body perfectly, but the head and right eye cap have always been a problem. What can I do to improve this?