Thanks for the details. I bought the PSU thinking I’d go ATX, but the SFF bug got me, and was hoping to use the PSU as I just bought it.
I’ll attempt to sell it I guess and get a good SFX.
I was prepared to buy this, but noticed SFX PSU's required. Any chance something like this will work in it? https://www.newegg.com/seasonic-focus-plus-850-platinum-ssr-850px-850w/p/N82E16817151190