Yes keeping a sicklebar lubed is tough/impossible. Been kinda thinking about a way to get the WS2 on it. It's usually oiled not greased cause you don't want to encourage dirt to hang in the sliding interface. Will be looking into a WS2 grease cartridge real soon....probably wouldn't hurt to grease the sickle bar with the WS2. I'd imagine the clatter from it only adds to the "howl"...
PS the WS2 we are buying is not "graded nano". Need to do a bit more looking into the relative particle sizes of lube WS2 and the stuff used in doping semiconductors.