Delta TMC2130 sensorless homing Marlin 2.0

Hello everyone,

yesterday I tried Marlin 2.0 on my delta machine. I use the einsy rambo - yes, very exotic for delta machines. I also enabled sensorless homing:

I played around with the sensitivity but the Z axis keeps crashing. X and Y axis homing works fine. Any Ideas what to do?

Also homing a single axis with "G28 X" just homes all axis - is this command disabled on delta machines?

Thanks for your help!