Looking forward to the response on this one. Last night I went out on my new bike (designed for slush). It is a new fit for me. In the past, fitters put me on big frames (long legs, but short torso and arms) and I was always stretched out. In fall, I had a fit for a custom bike and had them build up a winter bike (fenders, etc) so that I could get the same relative position.
Anyway, long story to the short similarity...my position on the new bike is way different. I'm not stretched out, yet my handlebars are below my saddle. I am more comfortable, yet not as comfortable. I wasn't stretched out, but I seemed to have more weight on the handlebars. Yet, the forward weight wasn't excessive, just present.
My gut feel is that my body adapted to the bad fit as best as it could. Now that I have a better fit, it has to unlearn its bad habits. I really find the new bike better, but it is so different.