This is what I am having to do as well. Forget the big gears. For us bigger guys we need to pay attention to a higher cadence and forget about worrying about topped out speed right now. Believe me once you get going up a hill you will appriciate that faster cadence in the gears. I'm around 390 or so right now and coming down fast. I still use my stationary as well but forget about most of the programs it has you do so I just pedal fast to get my heart rate up. (off topic but making a point).