Attached is an image of a program for our remote control. Is there any apparent reason that this program would be making our robot drivetrain move slower? 
My only thought would be the calibration of the controller. The speed should be set by joystick D & A.
Can you switch back to the other program? Does the other program still run faster?
… better hurry up and get it working… You only have a day or two… and good luck. 
Steve
When you say slower, slower than what as a point of comparison?
If calibrating the controller does not work, try adding the displayControllerValue(1, ChA); and displayControllerValue(2, ChD); commands and this will display the joystick values on the screen so you can check you are getting the full value to the motor.