First check what can't be fixed in the code:

Maybe somebody's already said this, but have you checked the connections from each PWM output to the Victor 884's? Then check the connections from the Victor's to the motors.

If you "fix" the code without fixing the hardware connections, your robot might work for now. But when somebody realizes that the connections are incorrect and fixes those, your robot will stop working and it'll be hard to debug.

Check software, hardware, then repeat.