The dealer returned that same evening, and spent a solid 2 hours tweaking the carriage assembly and belt drives to my satisfaction - as well as my husband's, who is very fussy. The machine appears to now be operating solidly, although I won't know for sure about the belts until I engage the AutoPilot. But as it stands, I'm a happy camper.
I am now looking forward to learning this machine inside and out and making some beautiful quilts. As for the dealer... well, let's just say he's more salesman than techie and he's got a huge learning curve. But I'm a generous spirit and I'm willing to work with him, knowing Innova will always be there for me.