[KrazyCarl92]

In general, the SuperShifter is intended to be used when wheels on your robot are direct driven by a live axle from the output of the gearbox. It sounds like you have a chain and sprocket reduction between the gearbox output and the driven wheels. This additional reduction could be why you feel that your robot is slow. We have the KOP tough box minis geared 10.7:1 direct driving 6" wheels to give us a speed of about 11 fps. To adjust the speed of your robot, you could also change out for smaller sprockets on the wheels or larger sprockets on the gearboxes.

I would definitely suggest adding 2 more CIMs to the drive train. This will increase available pushing power, increase acceleration, and reduce the amount of abuse the motors see. This alone will not increase your top end speed (maybe a very very small amount), but it will help you get there faster and could allow you to maintain your pushing force while doubling your speed through some other means (such as adjusting your gearing or sprocket reduction).