I found this article https://www.precision-elec.com/wp-co...zGc6o7L15ZxGvq

In that it suggests setting a higher starting frequency and changing the acel/decel times.

With nothing to loose I tried it and set starting freq to 15, acel and decel to 1 second.

I was able to start the spindle and did not blow the power....

I also took some measurements and there is 0.1mv of leakage, and whilst I can't check the range can see a spike on startup.

We have some other things running in the background so this could be a fluke. It is interesting though.