There's another issue:
Even if you do have micro-stepping motors, you've got to have the programming in the DMX chipset to properly control the micro-stepping motors. Without having finer control(16-bit), you can't really take full advantage of this. Plus, the programming goes WITH the motor. I can't explain it, but if you have X-amount of degrees of movement, then the motor needs to be calibrated to that in steps, and without having finer control, you're just replacing one issue with the same issue just with a different part.
If you NEED smoother movement, you need to do one of 2 things:
1: Get 16-bit fixtures, or at least 16-bit CAPABLE fixtures(I have moving yokes that have 8-bit and 16-bit modes)
2: Hope that your fixture has an option to SLOW DOWN that movement, preferably via DMX.