I have run DIY annealer 36V 20A power supply, 1800W ZVS board from aliexpress. Then some of capacitors blew out so i ordered another board and also new better quality capacitor. Also i changed tubing 4mm 8 turns ID 30mm. Now for no reason new board or old (with chanced capacitors) cuts power supply completely, it goes safety mode. Also i tried old 5 mm 7 turns ID 28 mm but same thing, it draws so much current that power supply wont stay on.
Seems like you need to change your board and stay with the smaller power supply (cheaper) or get a power supply rated for more current (more expensive).
I am running a 1000w board w a 36v 16.6a power supply. My coil is 1/4 tubing, 2 layers, 4.5 turns per layer.
It draws about 13 or 14 amps.
I also turned the voltage down on the PS to stay at the recommended wattage (don't run at max rated wattage).