Yeah I used to add more velocity points in to increase accuracy, but I’ve found in practice that it just introduces more jerkiness into the script when it’s played back on-device.
I think as few points as possible (while maintaining cadence accuracy) is the ideal - the brain fills in those little details when the script is actually being uh…enjoyed. 
Better firmware could solve this issue, but I suppose we should be making scripts that can be enjoyed on as wide a variety of devices as possible.