Wow, thanks for the quick and informative reply! I think I follow after reading a few times. I can see the acceleration visual but as you say that’s applying to linear motion on the rails. I will try to come up with a similar graph incorporating the threaded rod/travel per rev. It might not actually be faster overall if the acceleration needs to be a lot slower. The Z axis is only moving 6mm down then back up again.
Is there a setting I need to change to switch to 16th stepping or is that being done inherently by changing the steps per unit ?