Here's my problem. When I'm in a big group going downhill I'm always gaining on the riders in front of me. Not sure why, I'm a small guy at 5'7", 135lbs. The only thing I can think of is that I'm always in a draft zone. On smaller rides I can just move out a little and catch the wind. On big rides (2 or 3 abreast) I'm surrounded and have to feather my brakes. I'm sure the riders behind me really appreciate that. Any suggestions.