I'd like to invite both of you to joining me on the darkside and buying a D15. I have a 5900X and am doing a lot better than both of your outcomes. Blowing those Corsairs out of the water.. I can't get mine to go over 61C after 10 minutes of a Prime95 24-thread torture test blend in a 19.6 liter mITX case, holding 4.5 to 4.6GHz on all cores. In games as you're describing, I'm not going much over 50C. It does sound like temps you're getting on that AIO are within expected range.
Could be, but my original budget for this rig was $1,000 less than what it became. I sold off my 1080ti for a net return of $400, so that helped cover some of that extra cost, but I can't justify additional expenses unless there is a clear reason to do so for stability or preventing damage to parts. Neither of those appear to be in play.
By the way, I have temperature data for Jedi Fallen Order. During a 3 hour session it ran at 65C-70C.