daven1986: You don't really say what you are comparing your lack of stopping power to. Your standard caliper road brakes? I switched from XTR V-brake to an Avid BB7 Road disc, and 160mm rotor. It was kind of OK, but I wanted more power, so tried a 180mm rotor, and it was better, but still not what I wanted. I finally put on a 203mm rotor, and now it stops the way I want. The V-brake had pretty good power, but I wanted to avoid any possibility of overheating the front RIM on my touring bike that I tow a trailer with.
Have you thought about a larger rotor? This might solve your problem.
Mr IGH: NOW you have heard of someone who LIKES a BB7 Road disc!