Yo Robin sorry for the delayed responses. Talked to @Sune and here's a quick summary of what we know about this.
In theory the highest wattage is around 2800, but would require some serious cooling. Realistically it's more around half. The 30 amps with no cooling and with some serious cooling in the range of 50 amps. We don't recommend pushing the vesc close to 60 but it's possible.
On some previous versions of the firmware we had power cutouts when trying to run the vesc at 60 amps. I had flown a few meters at high speed because of that. So keep in mind safety