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Before you start changing parts, grab the temp gun and check things out.

Putting a little distance between the trans cooler and radiator may help a wee bit.
I'm not a fan of attaching things to the radiator core.




I agree. Check with the IR gun. They really come in handy. But they don't read very well of shiny surfaces. Like a polished aluminum radiator or chrome headers.

Sure optimum is the fan blades 1/2 inside the shroud edge. But I don't think 1/3 in would cause all the problems you are having.