The Slabs were baked at 350 for 20 minutes with the fan on (Convection). Judging from the browning of the chip crust I would not go over 350 degrees. Chips may over brown before fillet has lost the proper amount of water. You may need another 8-10 minutes without Convection for big fillets. Watch for the water bubbling in the cracks of the fillets. Good sign they are about done.