Well I think I figured out my problem. I was looking at the position of my knee when my foot was in the 3 o'clock position, which to my understanding, the front of the knee should be directly vertical to the middle of the pedal in this position. Mine was more over the heel of my foot, and the hub of the front wheel was well "behind" the handlebars, so I moved my seat forward a little and it seemed to help alot. I only did 35 minutes on my trainer today, crunched for time, but I felt no numbness at all, so hopefully the seat position change will solve my problem.