So you've up'd the current significantly - probably was a stalled motor. But 3A is quite high unless you've got large motors. Can you provide any details from any visible label on the motor? (or a photo)

I expect when you compare the DIP switch settings you're comparing the interpretation of the switches, and not just the switch positions? (chances are the meaning of the switch positions will be different between the two modules).

Slow?, that's strange - you have the stepper set to 200 steps (i.e. no micro-steps). Normally people configure the driver to around 800 steps/rev but that would make the axis even slower (4 times slower). When you read the switch positions you are reading from 1 through 6 (and not the other way around?) Have you changed any motor setting in the control software (Mach 3?)