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Isn't the original modification that adds the 7414 intention intended to invert the logic level of the pulse that goes into the 6560? If you add 2 NOT gates then it's like not adding it.

I got the 4 axis version of this board. The same one in the first photo. It seems working fine for me even without mods. I've tested it with a MaxNC machine and it gave me faster speed than I would...

This is a bit late to response. I have this problem when the acceleration settings in EMC is slow. Increasing the acceleration settings in the configuration file so that it doesn't ramp up / ramp...