It may very well be too high, but it works. This 2500-3000 velocity can be seen in this video. https://www.youtube.com/watch?v=hiXksh0ZlZ4. Here it works just fine.
When the things go bad, like in this video after minute 1.05 https://www.youtube.com/watch?v=KWlVfyy1hFU&t=1s, it is irrelevant what velocity is set. I.ve tried from V100 to 3000 and it just as bad.
It.s irrelevant what driver setting I have, 800, 1600 or 2000. Or if the workshop lights are flashing. It does not matter. When it goes smooth it does it with any settings and speeds, and when is not, it is not, with any settings and speeds.

The pc is out. Keeps restarting so I can.t try any new things just yet. I.ll sort it out somehow in the next days.

The first rule of ˇˇpulsing to slowˇˇ is never talk about ˇˇpulsing to slowˇˇ. :)) :P