Are you 100% sure that your compression test turned out ok? Mine was doing the same thing and it was bad rings. You can test valve seals by pouring a dab of oil into your spark plug hole and doing another compression test, but if it turned out ok the first time then that would mean that all is ok in there. I have a good feeling it's either rings or valve seals considering that's really all that can allow oil into the combustion chamber to burn it.

I feel for you man, mine was doing the exact same thing. I don't have a catch can on my PCV valve and I don't burn off... I will be adding it soon though.