GW, this wasn't completely helpful. Since I suffer from numb hands about 40-50 miles into a ride I would like to know what aspect of bike fit is incorrect. I am in a pretty good riding position, last saddle adjusment was just 1/8" to aleviate a very slight knee pain after about 50 miles.

If it's just a core strenght issue then some crunches and situps might be called for over the winter. But, if it's a bike fit issue, do you have a suggestion as to what doesn't fit right?