Ya, I'd go the smaller relays. How many elements you running? 3? I have 2 elements per contactor right now, 3 contactors, 6 elements' I have a selector switch to turn the elements on in pairs 2, 4, 6. So, use 6 to heat the oven, then for cure, I can turn down to 2 in summer, 4 in winter to help ease the power fluctualtions. My present 7500W oven dims the lights in the house, this 16000W one will do a little more LOL. PLus, I am estamating my power requirememnt's at 12000W, but have 16000. And the oven walls are 10" thick, not 4 like most. SO in reality, it might take alot less power to keep hot than I think(hopefully)
My elements came yesterday, so next week I can get heat in it. No door yet, but she'll have heat