ZF gearboxes do run hot, but it has been my experience to distrust the sensor switch. Also, as Sven (I think) pointed out, the TCase sensor and the transmisson sensor are wired in parallel, i.e., either will light the HT light. If you have, or can borrow an infrared temp tester, I'd "spot the Trans, TCase ,and line. You may not actually be running as hot as what the switch was originally intended to turn on at.
If it were running "too hot" you ATF would be black.
In the FWIW dept, the Pro-Line Radiator, sold by RN is a four pass core, and a genuine is only a three pass core. The core tubes also seem (eyeball caaliper) to be slightly larger too. My son and I put one in our RRC and it never ran so cool.
Rodding the radiator won't help the transmission cooler as that is in the left hand tank. I also don't believe in rodding a LR radiator as the core passageways are VERY small, compared to an American car's radiator.
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