So I got some new boots the other day, and because they haven't packed out yet they're pretty tight at the mo. Despite this, I'm getting a little bit of heel lift, but not with my heel lifting off the sole of the liner, but the liner lifting in the shell. I'm pretty sure that as they pack out more and I can do the 45 degree clip tighter over my ankle without my foot going dead the problem will go away, but I was wondering if there was a way to stop it now, like putting some duct tape down the back of the shell so it's not just glossy plastic and has a bit more grip.
TL/DR: Getting heel lift with my liners sliding up in the shell. Wondering what I can do to stop it.