So … a few weeks later I received yet another SKR Pro board…
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Problem solved! I homed it 20-30 times without issues with the machine cold and warm and with increased and decreased motor power etc… no issues at all ! (so far). Will do more testing tomorrow.
Regarding motors getting hot at 900ma… mine were completely cold. I think I noticed a few skipped steps during some cuts, so I increased the current using small increments and left it at 1200ma. Anything higher than that makes the stepper heatsinks hottish while the motors are only slightly warm.
Next tasks: make the table more rigid, connect the vacuum and finally do the first foam cuts! I am slighly worried that the super light foam chips might clog the vacuum quickly, but we will see.