Have you tried starting the print from Studio or Handy? If so, try adjusting the speed directly on your printer’s screen. I’ve noticed a strange issue where some settings are ignored when I initiate a print via Studio or Handy, but work correctly when started from the printer’s interface.
In my case, the printer overrides my disabled automatic dynamic flow calibration and runs it regardless of the checkbox. When I start the print from the printer’s screen, however, it respects the setting as intended.
But do use the thread aboit 01.08.50.20 so there is a nice wayt to keep track of the bugs.