[Kevin Sevcik]

Ok, so the motors spinning at different speeds is utterly unrelated to programming, and almost definitely has nothing to do with the Victor calibration. The real issue is that all the motors FIRST gives us are wound with a lead angle of some amount. What it boils down to is that they have a preferred direction of rototation. So a given motor will run faster clockwise than counterclockwise. See this for ideas to compensate:
Robot Drifting