I have been commuting a couple of times per week on my new Jamis Coda. I really like the bike but my hands get sore, even after just a mile or two. I wear padded gloves, but this does not seem to help much. I am used to a road bike with drops and riding on the hoods, so some of this could be getting used to the upright position and flat bars. Any recommendations on how to make the grips more comfortable? Any experience with replacement grips? Thanks!