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I've managed to reach 1000 mm/min now. The voltage over my steppers had to be 0.15V for it to work which is a bit higher than what you recommend. One of them had only 0.12V and lost steps when the speed increased above 400mm/min.
I also had some issues with the software as seen in the other posting. I can run the steppers much faster with the g6 command rather than through the G1 command.

There is an interesting effect where it seems that the Arduino may not be able to keep up with quick feedrates.
I lowered the SEGMENTS_PER_SECOND and it gave me higher speeds without losing steps so there is something there as well. The internal calculations which are a bit different for a Hangprinter seems to throw the steppers off somehow or at least make them more sensitive.

I will redesign for minimal radial load on the spools. The loads on the steppers are small in general because the printer hub is very light. Still, I will do what I can to ease the load.

Many thanks Martin