Found a video of someone running high mode pushing near 4.2TH with the authentic Avalon adapter at 125W (don't know for what duration of time) and it was clocked at 140 degrees F.

I think you have to go medium mode. I'm seeing 3.15TH @ 90W as reasonable. This is going to give you approximately 15-20% less output per day but this is going to be the more prudent path. And I wouldn't mind trying one of these $28 130W rated DELL power adapters in that scenario.

I just want to get a bunch of these and not have to stress over them when I'm out of the house like I used to years ago with my Nvidia 3090s. Nothing worse then getting alerts and having to remotely shut down your rig because you're running too hot.