No one linked this yet so I figured I would. Watch part II as well. That's what I did to mine after I filled it up all the way and left it standing up the first night... lost a lot of juice. I can leave it standing up 2/3 full or less ever since I did this method, not for super long times, but I have taken a 2-3 hour nap with it 2/3 full and woke up to no mess. I actually tried a few things and nothing was really sitting right, drip tip rings, carto condoms.
Best thing I used and haven't looked back was an o-ring from an old pro tank II head. Think it was the stiffest middle one but I could be wrong. And so far I've used round SSOCC 0.5's, Ni200 SSOCC, and the old square OCC coils without issue.
By the stiffest middle one do you mean the base washer that seats the coil body to the base of the Atty?