Are you allowing time before you attach weights for the head to expand in the chamber? A little pull back is okay, a full inch is extreme. What level of erection are you taping at? The tbone method is really good for higher weights or longer hangs. I really recommend my way for your current weight it'll allow better glans expansion as well. I think it's $15-$20 to buy the glans protector cap. Here they call it the silicap but it's the same thing. If you want to go cheap you can look up the toe protector caps they spawned from.