Anyone built a cooldrv stepper driver? (no replies)

I recently built a set of cooldrv stepper drivers with the drv8825 drivers and tested them on my sanguinololu and ramps electronics and with both, the motors turn much slower and seem to grind / vibrate and make a horrible sound. I tried removing jumpers to change micro stepping settings but this did nothing.

These boards were described as being drop in replacement for pololu drivers but mine don't seem to work. Do I need to change some settings in the firmware? I am using sprinter.

Any suggestion would be appreciated.