um.. citrus lube, then reverse rotafix?
sit that hoe on a bike stand, dont just dangle the seat on the arm thing clamp the post/seat tube on there, reverse rotafix that ***** and it should come off. if not, i dont think anything will work.
skidding will only do as much as the traction of the tires can withstand. rotafixing is claimed to be able to do away with the lockring, but can be reversed by reverse-rotafix. iunno i've messed with the rotafix method and it seems to work pretty well.