I'm glad that you found a good LBS that will let you demo a bike. That's the kind of service that you need. But don't write off custom if you're still not dialed into a fit. I'm 5'10" and have a similar inseam to you, so I'm essentially all legs and no torso. After several LBS's and a serious fitting I finally decided to look into a custom build, since just stem swapping didn't get me the reach I wanted. It took a while, but I found a local builder who built me a fantastic steel frame for just a bit more than what I was hoping to pay for a stock bike. I had to go with components a step down from what I hoped but that's always upgradeable, and I'm not a racer so no biggie. And you can get the colors and parts that you want. Anyway, good luck and take your time!