@r1 ! I asked 2 people yesterday, and they blamed it on "head problem" ...meaning, bike's values, rings or piston ...something has deteriorated, and needs changing. But they also said that the first suspicion should be on Spark Plug itself, and that sometimes aftermarket plugs (like Iradium ones) cause these issues.
Now, i don't really believe them but their opinion might have differed if the bike was infront of them.
Anyway, the first NGK Plug you used ... that seems to be a sasti quality one. Or Was it Original NGK? Here is what NGK website shows, to identify do number plugs: PLUG STUDIO / NGK
The second Picture, Denso Plug. Why is there Oil around the Tip?
The 3rd Picture, of that Malaysian Plug you are using, it shows your bike is in perfect condition.
So there you go, i am also confused on what could be the problem :S Time to tag other specialists in the thread, like @vickytulla, @xulfiqar, @aximaxim ... brethren