Did you read this article that I posted from Women Specific.com. http://womenspecific.com/cycling/35/...men-specific-- There is specific information on how seat tube angle affects your fit.

From what your describing the seat tube angles are too steep for you. The Specialized Dolce has a st angle of 76 degrees. It looked like the Giant 2XS, not sure what size you were on, has a 74 degree st angle. I didn't check Trek but it's probably a 75 degree st angle.

Also, did you actually ride any of these bikes or just sat on the trainer? I ask that because I demoed a 48 cm bike last fall. We knew it was to big but I was evaluating the frame material not the fit. The LBS set it up so well that when I rode it around the parking lot I was surprised how well it fit. However, they let me take it for a 10 mile ride. Boy, did I get a rude awakening. My body could tell exactly how poor the fit was. I did like the frame material, though.

The best thing to do is to find out exactly what geometry you need then try to find a bike that fits that geometry. Find a shop that has a good fitter (I like the Serotta fit method, but there are others) pay for a fitting, then go shopping for a bike. Some shops waive the cost of the fitting if you buy from them. That way you'll have a bike that fits well and you will love riding without second guessing or trying to fix a frame that didn't fit in the first place.

The one shop you are dealing with sounds like they know what they are talking about but the more you know about how a bike should fit you the better off you'll be in the long run.

Realistically though, small bikes are generally built with steeper st angles, so you are going to have a harder time finding a small frame with a slack st angle.