im in the same boat, same axle as you
both drums spin freely, and i can pry the back edges of the drums out from the backing plates, so i know for a fact thepads arent whats holding it
i beat out the wheelstuds, because i was told it could be sticking to them, and that didnt help at all, the problem is just that the center hole in the drum is basically too small, and becomes easily rust welded to the part of the axle flange that goes through it
of course i could destroy the drums to get them off, but it would be worth it to see if they are within spec and could be turned and reused if possible
ill post up if i figure anything out, but i only get to mess with those sort of things when im home from school on the weekends