Two pulls are one too many!
If you can only get into 4 th gear, apply the brakes to make it work hard.
It is not about speed, it is about making the engine pull hard. For 10 secs.
During the process of heating up and cooling down the smoke ring now lies.
New plug, one run WOT, any gear, engine pulling hard at good revs.
The needle setting seems too rich for your elevation.