Thanx for the link. My eyes aren't what they used to be, but if I had to pick one, I'd have to pick 1. When I first started riding it, I didn't have to choke it at all to start it, now I have to even after a short shut down---but just for a second or two. All in all, it looks like a possible choke problem...woe is me, what to do what to do !?!?
#1 is a wet oil fouled plug...
Keep in mind that guide is covering 4-stroke as well, so for instance "oil pumping past rings" would apply to 4-stroke and not these 2-stroke motors. Since the CNS carb doesnt have a choke you can't really have an "excessive choking" problem... Remeber, the CNS carb does not have a flap to choke off the air, it has an extra enrichment fuel jet that gets opened when you pull the choke to richen the mix with more fuel rather than less air.
I forget where you are located, but I never needed the "choke" at all until it started getting cooler, now I need it for the first couple seconds, thats it...
Since you seem to have a wet condition on your plug I can think of a couple directions you can explore....
1) continue to move the needle away from the point to keep leaning her out. You might try cleaning the plug then running her hot at WOT for a while and do a plug chop at WOT. This will tell you if the mix from the main jet is ok, cause the needle and pilot jet don't have much effect at WOT. If plug looks ok at WOT then I would continue to lean out the mid throttle with the needle. or....
2) You may need to do a float adjustment to lower the fuel level in the bowl of the carb. This from my experience tends to lean out the mix and move a wet plug into the dryer regions. My motor was running wet, not idling, dripping from exhaust etc until I did the float adjustment. Reread that section on my thread on tuning my carb....
3) Ignition trouble is also listed as a common cause of this plug condition. I know the stock spark plug wire and cap are total crap, are you still using the original parts there? My spark plug cap broke almost imediately and I replaced it with a high quality wire and boot from a car motor, so I don't have experience with what running the crappy wire and cap will do to your plug... But it is worth a mention here since ignition problems are a common cause of a wet oily plug...