I've got one that I just scratch my head over, need help.
The bike has been tuned by me, twice; two different owners. Strong, IIRC HP in the mid-180s. IIRC, traps in the low-150s
Tunes fine on the dyno, no problems. When you take it to the track, first pass is great. The next few passes the bike breaks up in 1st gear, but runs fine from 2nd gear up. The next couple passes, breaks up in 1 and 2, 3rd on up is fine. More passes, worse it gets.
When you disconnect the Power Commander, runs fine with no breakup, of course runs a LOT slower and I am sure is detonating from a lean condition. First owner, got mad and purchased another Power Commander. Did the SAME thing. Got even more upset and sold the bike. Now the new owner wants it to run right.
I'm clueless.