Hi Lisa,

Glad to hear the stem change worked for you; however, one reason for WSD bikes with shorter top tubes for a given seat tube size is so that standard (9-10cm) stems can be used. A 5 cm stem is quite short and can cause the front end of your bike to handle a bit squirrely. I used to ride a Terry Isis with a 6.5 cm stem, and that was one of my few complaints about it. When I changed to a bike with a 9 cm stem, I instantly felt more in control of the front end.

Here's a little article on determining the proper stem length for you that you (and others) might find interesting; I knew nothing about stems when I started riding and have learned a bit since then!
http://www.ehow.com/how_14135_determ...rect-stem.html
Good that you moved your saddle back - moving it all the way forward to better reach the handlebars isn't very good for your knees or climbing power. Ideally, a plumb bob dropped from the front of your kneecap of the leg in a 3 o'clock (front horizontal) position on the pedal should intersect the pedal spindle, or be behind it, not in front of it, which is how your initial set up might have been. This is sometimes called KOPS (knee over pedal spindle). If you have to move your saddle way forward to comfortably reach the bars, your top tube is probably too long....

Emily