[TubaMorg]

We are using an open loop this year and we have used it in the past for our mecanum drive, though we use direct drive and a higher gear ratio than the KOP transmissions. We aren't using encoders to control wheel speed, but we ARE using a gyro to make sure the robot stays pointed in the right direction.

We aren't experiencing control issues perhaps because of our differences. You could fairly easily increase your gear ratio (in a way) without too much trouble by changing your sprocket sizes. A smaller output sprocket and a larger wheel sprocket will slow your wheels down.

Hope this helps...