Power on hours contains more than just hours, more like a timestamp. I'll post one using smartmontools which shows how it can be interpreted

@ct
I'd upgrade the firmware, my LEs are all at 1.33 and performance is just as great as the old FWs, can do a test for you.
Pretty strange that your "NAND" writes vs Host writes is close to 1 and that you are writing more than you are reading, do you reimage?

What annoys me is that the old drives will only increase usage attributes every 64GB, SF2 updates every GB.