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I’m beginning to think that maybe people with unsolvable overheating need to start flushing with vinegar or something similar that will break down mineral deposits. When every piece of the cooling system is new and it still overheats then it might be a problem with heat transfer. I think as a guideline the fuel trims and related areas should also be checked as an engine running lean could also produce that too much heat. If that all checks out I would think flushing with an acidic liquid would be worth a try. Of course do so carefully as it could eat away at good metal if left in too long or too acidic. I have tried to find out what ingredients are in the Preston’s flush and similar products but I haven’t had any luck. Not sure whether they will actually dissolve minerals or heavy metals. I have read posts from non jeep forums where using vinegar or similar works well and works when nothing else would.