Worn TMX needle or else

[paulnobodyimportant]

My out of the box TS1225 has an open mouth TMX35 carb. It has a 55 needle and was originally set up and dynod by Chiselspeed on setting P3, ie 3 clips from the top. Over the last 5000 miles I have lowered the needle, in half a clip increments and plug chops to keep it running sweet. The needle is currently on the top setting, ie P1 but after say around 500 miles is now running rich at around half throttle. Now I understand that you cannot replace the needle jet, which may be worn. Therefore, do I get a new 55 needle or use another thicker needle.
FYI the carb is jetted as follows
Main 340
Needle 55P1
Pilot 17.5
Slide 60

And advice would be welcomed.

Thanks

Paul

[Stampede]

I would suggest:

lowering main-jet (about 300-280)
needle 57 or 58
Pilot 22.5-25