I really appreciate all the suggestions.

Emily, I definitely think I will try the longer stem length. My local LBS guy mentioned that as an option. He also mentioned wider handlebars, which I'm interested in at least testing out. Maybe it will make a difference for me w/ the twitchiness, maybe not. I didn't go to him for the fitting because he doesn't do a really detailed one, which I had heard this other guy did. This other guy also told me that a longer stem length wouldn't help, btw. I think he really wanted to get that 2004 out of the shop.

Also, thanks for the info on the 650 wheels, Lisa. I'm not a racer, but if I can get up hills faster, I'm all for that. The Dolce did have 700 cc wheels, and the guy said that toe overlap would absolutely not be a problem.