I don't think it is your jetting (although I don't think that is set up optimally, either- more on that).
Sounds like an obstruction or a vacuum leak. I'm with oldroadie, too. we'll try to check two things at once. My first stop would be with the vacuum caps (a.k.a. squirrel condoms"). If the AI is gone, there should be three fairly robust caps and one that doesn't really match (head side left). Replace the one head side left with the carb side left one and put a balance tube between the carbs. Ride it. See if that fixes the problem. This will test for the odd cap leaking and balance of the carbs. The little odd cap may look good, but they are know to go bad in less than a year. Mine looked great and was not leaking, but when I tried to take it off, it tore in two.
You don't need a merc tuner. Search homemade balance tool- or get someone to do it for you...
http://www.bonnevilleamerica.com/forums/...part=1&vc=1
