I think your entire theory is valid and I agree...but I'm not gonna go much further to chase heat reduction.
My approach has been...
1.) Use the Tazer with the ability to operate the fans manually
2.) Make the hood vents functional (see my photos in this post)
3.) When all else fails, back off the throttle when things start to creep up
The heat issue "is what it is"...I'm fully aware of it and just deal with it.
Another approach would be to pull the engine and adapt in another little early diesel all hot-rodded with crazy engine controls, wazoo turbo's and massive injectors...LOL Can you imagine??
Just dream'n...HEY, IT COULD HAPPEN!!! But if I blow this thing up, it would be cheaper than replacing this Italian job...
Heat is the enemy. As long as, while we are operating the vehicles and temps are this high parts are expanding and creating more friction, increasing wear, failure, and shortening parts life cycles. No thanks I'll hope and try to expedite someone making a part that keeps our mills crazy cool like they should be. My oversized cooler I piggybacked on a Bulletproof remote oil cooling system was far cheaper than a motor swap to a 12V.
Here are how low I got my oil temps with my oversized cooler.
Under load @ 1/2 loaded
Under load fully loaded in hot climate