The heatsinks also arrived and look great, thanks again KCut! So have now tested at 190A (Max my powersupply can do) so far it manages to run for 25s before hitting the temperature limit and throttling down to 135A continuous. Although this is clearly because the thermal transfer between the board and heat sink is not good enough. So I have some better thermal pads on the way to try out.

I also have some temperature sensors and hall sensors turning up soon to test out throttle on motor temperature and sensored mode.

Started producing the first batch of 10 boards. Don't have enough FETs to populate them all but it at least gives us spares.