I just got back into biking about a month ago and things are coming along nicely. I commute 7.5 miles to work and take a 20 mile trip back home at night. I ride a Felt S91 with a flat handle bar. Problem I'm having is that my fingers are going numb about 10-12 miles into my trip home. I purchased padded gloves, but still have this problem. What's my next step? Different grips? Is it possible that my seat height is not correct. I do seem to put a lot of weight forward on my hands, but for my legs and pedals, I'm at a good height.