yes, I had this exact same problem two weekends ago at the Vicious streetball event. So did another victory owner.
I tore mine down and re-lubed it and believe that I've got it corrected now. However, I'm running 80/230 to get a not-very-consistent 270-280fps. A couple of my other suspicions (on mine anyway), is that I've still got a white donut, and it was a little cool that day and I noticed that when I tore it down to re-lube, I don't think the front and back of the engine were snugged down.
Is it possible (or likely) that the two outer pieces could work just a little loose? Would that cause a velocity problem?
edit: my thread
on essentially the same problem
edit2: I don't think barrel match was the problem that day, as I was using a Furious .685
edit3: bumping my dwell up to 8 seemed to help a little, but it was still horribly inconsistent
if you find a solution, please let me know as well =)