Did you ever find the needle, and if so, did it fix your problem, my bike acts normal everywhere except in 5th gear 1/8 to 1/4 throttle, I am wondering if this could be my issue as well.
We are talking about the needle jet, not the jet needle.
Your specific issue needs to be narrowed down
-unplug the tps
- adjust your valves
- new plug gapped to.9\
...before assuming anything else