Hey, I'm with you OP. I've had locks for about 9 years.
So aside from the stupid remarks about shaving heads, and nair, any other suggestions?
I had the same problem with bike helmets.
I noticed that only a few companies make XL size helmets, but that's the ticket really. I've tried on Bern and Smith, but the only XL helmets they make aren't what I'm looking for and are still a little tight. You could try getting a helmet with a removable insulating liner. Locks are pretty insulating in themselves, so, no need for added.
It's really compounded by the fact that a lot of resorts require helmets in the upper portions of the mountains.
Anyone with any real knowledge, not just half-witted attempts at humor?