Thanks for the feedback-- I'm definitely dumping this LBS.

There's another LBS, about a 30-min drive, that I'm going to check out this weekend. They sell Specialized, Trek, and Surly, and have a Dolce that may fit me. If I come in for a fitting, they are willing to order a Terry for me to try, as well.

Depending on how well that goes, I'll probably also get in touch with the Terry dealer that's 3.5 hours away and plan on a weekend trip sometime soon. While they don't have a smaller Symmetry in stock, they said they could get one in for me with 1-2 weeks notice, no problems, no charge/obligation. That's the shop where I bought my first Terry, and I've referred a few other customers their way, so it is a decent option.