sounds like you should do a compression test....to be that lean on your jetting,and still have a black/wet plug does'nt sound right.You're leaner than I am,and my plug's always a nice medium brown.
I'm running
168m
52p
2nd notch
stock needle
2 1/4 out on air
I'm at 250'-500' above sea level,and I'm on the lean side.