Hello Luis,
I soldered a 10mm piece of AWG 30 wire from the sense resistors directly to pin 14 on the device and removed the previous ground connection from the sense resistors. The result was a much improved current wave form and much smoother performance of the stepper. It's not perfect, but it is very much improved. I suspect with a clean layout with proper attention paid to the sense circuit I will have a functioning system.
I now plan to design a test board with only one device to prove out the layout before I go for a full board again. After reviewing many posts here on the forum I am thinking it may be good to switch to the DRV8880 and take advantage of the Autotune functionality. I do not need the full 2.5A capacity of the DRV8825. It sounds like the DRV8880 will give me the best chance of the quietest and smoothest operation. Have you had good success with these devices?
I will be viewing the EVM-DRV8880 hardware files prior to doing my design.
Thanks,
John