Rather than fiddle with the Z axis drive and all the complexities that entails, do a ramp test.
If it has autofocus, do that on a flat sheet, then lower the platform maybe 5 mm.
The typical 2 inch focal length lens will give you decent focus over a millimeter or so, so measure the nozzle-to-ramp distance at the narrowest point of the line, then mark that height on a step gauge (like those). Now you’ve got a good cross-check on the autofocus and a way to set the focus wherever you need it.
From 50 mm/s to 500 mm/s and 10% to 99% power to get an idea of the range, then narrow that down for each specific material.
There’s no substitute for experience and you’re about to become the Resident Expert™!