In this case, the first thing I would do is calibrate the Chicklet. Follow the directions in the manual
here. If you calibrate your robot code or Victors to match whatever the joystick is outputting now you could create a dangerous situation. Consider this: if your Chicklet is outputting a value of 110 when the joystick is centered, and you calibrate to this, then if the Chicklet gets unplugged (setting the joystick value to 127), your robot will drive forward. As a rule of thumb, you always want to start by calibrating your joystick such that it outputs 127 when it is centered.