[AdamHeard]

This is really a case where modeling can be very useful. JVN's older drive calc is perfect here.

One can take the same drivetrain, and model it with different gear ratios and # of CIMS.

You can then compare whatever you're concerned with;

-Time to reach a certain speed
-Current draw at slip, during acceleration, at top speed
-Top Speed
-Total power used during acceleration (current draw * voltage)

You can then compare with actual (modeled) data which beats speculation. You'll start to notice some trends (that are partially a matter of opinion) like after 16-18ish fps, acceleration tanks with a 4 CIM drive, and at about 10-12 fps adding a 3rd CIM just isn't a huge performance gain aside from requiring less current per motor to slip wheels.

Don't take my word for it though, model away!