I'd start looking for areas where air is by-passing the radiator. Are all the factory AC option air seals in place? Around frame horns, between bottom of radiator and core support (A body has these). Assembly manual usually outlines all the additional seals used on AC cars .
Only other thing I could suggest is going to 50/50 mix, I think that's considered optimum for heat transfer/protection. Of course check the lower hose for the spring.
And ... how accurate is the gauge ... jeez if you were only 10 degrees cooler across the board I'd call it good for a big car, big engine with AC.
How does it behave in the same weather sitting in traffic?
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