Thanks for doing this test. It is very useful.
This matches my experience. The FW may blend two sections into a single downward stroke and stops earlier than the script indicated.
https://discuss.eroscripts.com/t/handys-firmware-blends-slow-actions/107231/3?u=falafel
A workaround I’ve discovered to script slow action is to use tiny vibrations like the following. This ensures all actions are above 40unit/s. Whether or not this is suitable will however depends on the scene.