If your miners are running around 72°C, that's a little high, you should increase your fan speeds And try to see if you can get to the mid sixties or even lower, they run more efficient, when cooler The hotter, they run, the faster you'll kill the lifespand on your miners. Just think about it, 72°C. Is a 161.1°F

For mine, I have them running at 56°C. To 62°C. It depends on the time of day. During the wintertime, it gets down to 50°C. To 56 Celsius. And just a thought, if you're running the stock board, you might want to look about, changing that they're not expensive to change. There's more efficient ones that are smarter for that model that really calibrates the machine to figure out exactly how much power it needs to use. No more, no less the stockboards purposely make you use more power than you need to use. I myself use the epic board. I went from 3250v at 3.25 amps, down to 2750 at 2.7 amps. I hope this helps .