Haha hey if it works it works! I've zip tied a case fan or two in my day. 😅
So I've also got the 3k rpm noctuas. I find that anything ~under 1.2k rpm is basically silent. 1.2k-2k is reasonable for an office or bedroom. After that it starts to get loud but it's bearable.
Yeah as for temps, I just left it at default. I rarely see it over 92 degrees and it stays pretty stable around 90 most the time.
I'll have to take a look at the pdf again. I read it before I got my miners but haven't gone back to test their settings. I've got one I haven't hooked up yet in the garage so I might use that as a test heater once it gets a little colder out.