Welp, I flamed out 3 times in the main yesterday with my b5. I think my idle just needed to be raised, but I haven't had a chance to really investigate other than raising the idle in the pits after coming off the stand and evaluating the idle drop. Idle drop was good, could have been leaner on the bottom probably, but when it dropped all the way down, it didn't want to stay running until I raised the idle. Thing wanted to die instantly after coming off the throttle when it was a little rich. Might be plug too, or exhaust seals, or perhaps clutch bearings -- just really haven't investigated at all as I had to go drive my electric car for the next main.

I'm betting that my low end needle and idle screw need some love'n as they're still set at the same place they were on the first race tune on the first time I tuned the motor after finishing break-in. My guess is that it has run in a little and I should have updated the tune by this time.