I've never intentionally pulled either brake harder. That could also be the reason that I fell twice when warming up and 4 more times in a 6 lap cyclo cross race last weekend.

Thanks for the discussion guys, one more thing to consider while riding as fast as possible while facing an array of hazards. I was blaming the unintentional dismounts on tires and pressure choice. Right before race time I decided it was more important to take a leak than take some air out of my tires.