The only issue I've had since installing my custom midge chops (10" wide at the most) is attempting to sprint. Since my arms are at an insane angle, I get absolutely no leverage out of the saddle. Skidding and skipping can be done in the saddle with very little movement as a result of over a year's worth of practice and fine muscle tuning. Sure you can really get the boys on the stem with bullhorns or drops, but speed modulation is never a problem with flats in my opinion.