Seems to me that there is another problem.
People have tried all sizes of radiators,
All sizes of fans, all kinds of combinations of ideas and they all point to one thing. Air flow.
Hood scoops help, stock or updated clutch and fans work. Everything else should help but it doesn't.

I was out in Barstow a few weeks ago and in deep sand washes littered with rocks I started getting to the
Big H on my gauge. It was 112 degrees out and who knows how hot in the washes (yes my A/C was on)
I sped and put it in park and just sat there with my foot holding the gas peddle to a fast idle and it cooled down to just before half way on the gauge. Sounding like a airplane stuck in the mud, A/C still on.

I kept thinking of all these posts and my brain kept coming up with air flow. I couldn't cut the hood in nowhere land, couldn't check all there other things out in the bush so I pulled the grill off, my temp never left 1/2 way on my gauge for the rest of the day, air flow. Hummmm. Anyone else ever pull their grill off and try it ? Worked for me so I made a summer grill.
Seems to be working.