we used to get hot in slow traffic or stop lights when the temp got over 90 outside.
the fan it only there for when you are stopped or not moving fast. once you are at speed. the fan it basically not doing much as your pressure wave is really pushing air thru the radiator.
Instead of trying to adjust radiator types and thermostats. The all purpose properly fitted shroud solved all the slow stopped traffic issues. temps stayed where they were supposed to year round.
with 180.