Aux water pump will get you 4° cooler — when moving, maybe 2 when not — I have a bigger rad (CSF), separate trans (auto) and oil coolers, plus all the hx coolers — still gets to 217° In the summer. More venting of the engine bay and a belly pan would help. I also created baffling to force the air through the radiator.
I’d see if you can baffle the air towards the radiator and eliminate areas where it can sneak around it — bottom, sides, top. Belly pan would help with pressure differences also...
I looked for fans, the only thing I founds was a JMS fan booster to run the fans faster at idle — that is another option.
It gets hot here too ;o)
-Don
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