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If it ran so poorly that soon after buying it, why don't you have the dealership deal with it. They should have at least some kind of warranty to cover this sort of thing.
I missed it, did you plug the vacuum hose or cap the port?
Have you verified valve clearances are correct? If the dealer tried to do a service on the bike at 600 miles they may not be set correctly. Also the bike should have the heads re-torqued.
What's the mufflers look like are either turning color? This thread has similar issue talked about.
https://www.guzzitech.com/forums/threads/help-with-new-v7-special-dies-when-let-to-idle.15776/