I don’t know if this can solve your problem and the people who also have it.
I discovered it recently, by default the movements are smooth, if you click or press on the up and down controls of the device the movements are longer and not so short, then the handy makes the movements until the end from top to bottom.
That said, you just have to configure it to your liking, calibrating with the up and down buttons.
And one more thing, when you see the blue light flashing red, it means that you are already at the limit and no matter how much you click on it, it will not go down or up any further.
Special mention to Thanny who is the one who thanks to him I discovered this:
https://discuss.eroscripts.com/t/handy-are-there-any-handy-script-sections/4672/6?u=sifita6