Hi arhijawi,
I don't think there is a requirement of the pulse being 10us. In fact it would be impossible to go 200KHz if that were the case.
If you use the 3.78us pulse and set the polarity so the drive steps on the trailing edge of the pulse then the drive will step 5.7us after the Direction changes and meet specification.
But better yet may be to use the CW/CCW mode which I believe is supported by those drives and KFLOP. That avoids any Direction setup time issue.
The Axis parameters will determine the Maximum Pulse/Step rate and the Acceleration. I'm not sure exactly what you are asking for here.
HTH
Regards