We switching power off at standstill, so there's no back emf... Its a shame, I don't have oscilloscope to prove it...
And let me quote you:
Quote Originally Posted by mactec54 View Post
... the Drives control most of the back EMF, there would be very little EMF that would get back to/hit the caps

I though that you had used a linear power supply, which you would of needed at least ( 1 ) Cap the size you had, so with the quality SMPS that you used, you would not of needed any Cap's at all, may be one for safe measures at the Power supply to help protect it from anything going back that could affect the SMPS

The best thing is not to have the Caps there at all, and only at the power supply if it needs them to filter the rough DC power