Finally picked up my bike from the dealer on Saturday. Almost two weeks and multiple calls. After much pleading, they finally called Suzuki tech support and were advised to check the throttle body (exactly what I told them, based on this email string, when I dropped it off).
They did the balancing, and the bike seemed MUCH better on the 5 mile ride home (I'll need to put more miles on her to be sure).
I lost some respect for my dealer, but they did not charge me for the service. (Maybe Suzuki picked up the tab, or they realized they should have done this at the 600 mile service).
Anyway - case closed. Thanks to Burgmanmaniac for starting this posting.