I am so close to auto fatello. How do i get 1 or 2 more inches towards my penis?

I tried the walk my feet down on the wall, i came so close. I can almost do it by just laying on my back and kicking my legs over my head. I want to do this so bad. I need about 1 or 2 inches to the head when im erect. Is there any tricks or stretches that will get me close. Please Help!!