I would prefer if Trampa answered this. I used the same values with my 6384PG Surfboard without foil and got maximum 3.2kW. There is always some noise and the remaining safe value is much lower. Otherwise you risk HW Abs Overcurrent Failures which will make you fall which is not acceptable.
Also this peak value is not RMS. And last but not least the maximum dutycycle is 95%, so the battery current is even lower, meaning you can get best case 48V75A less than 4kW and worst case 37V75A around 2.7kW. Are you able to start with that power? Which might be even lower, because the current limitation jumps in at low speeds.
Anyhow, if someone wants to try, order some 0.3mOhm shunts, that solves problem.
If you then optimize the cooling you can go longer for full power.
A lot of losses in VESC are switching losses. You only get rid of them by fast switching which increases power losses in the caps and of course by proper cooling. Also the shunts have their limits, also pointing in direction of less resistance and thereby linearly decreasing power losses.