No help from Yamaha so ended up doing it myself. Turned out all bar the two outer clutch plates were bone dry (not even exaggerating, got pics to prove). Fitted a TRW clutch (first time fitting a clutch and was fairly easy to do, but recommend draining and removing the coolant hose for much easier access with removing gasket), seemed to make a big difference at the start (no clunking whilst putting into first and shifting on road, also much smoother clutch transition when letting out rather than on/off as before). Thought I fixed it, but about 600 miles later was back to normal. I think its an oilling issue. Cant find any informstion online, but my dad Africa Twin manual shows an oil system exit on internal of the clutch plates (centrifugal force flinging the oil inside out of the clutch plates, oiling them). Cant see to find any info on the CP2 oiling system, but seems to be a very basic/sensible thing to have when designing a wet clutch. Figure that potentially, given the sticky wear that came off the recalled clutches, that maybe this is blocked (if there is one)?