I would sure double check the gauge before pulling the radiator. Mount the sender in the thermostat housing for more accurate reading. My 250 read 20 degrees hotter between the cylinders then at the thermostat. The water leaving the engine is what you want to measure anyway, not whats deep inside it.
Drop a cooking thermometer in the radiator and see what it says, its quick and easy.
Sounds like its running OK, if it was truly hot, you would be able to tell. And as far as fan spacing, it would cool off the faster you go if it was air flow causing this. Fans do most of there work at idle and slow driving speeds where there isn't much air coming in the front.
Joe
