Dude, nobody will buy these from you now after you showed them those temps.
The fans you used were too low of a CFM, you should of just swapped S3 fans on them. Or got the expensive Noctua fans, and you would get temps around 50C.
Those looks like silent/quiet regular case fans which spin at like 1200rpm.
I would power off those right now immediately before you burn your place down.
99% sure you're blowing this way out of proportion. They hash fine, they have absolutely no fire hazard associated with them whatsoever, and I could show you much lower temps if I were to bother turning them on in a room that doesn't have the heat turned up.
Again, this was a demonstration (They have been off for a month or so now) to prove that they hash.