Nothing at all wrong with 212f water temps. Oil should be 10 to 20 degrees hotter. You want the oil to run somewhere around 220.
It is the oil temp that needs to boil out the moisture.
If you use full synthetic oil like Mobil 1 it is good to about 400F so there is no issue with cooking the oil at all.
You should have a 16psi cap on the cooling system. That will give you almost 260 f before the coolant will boil over.
I think you are running on the cool side of normal. I wouldn't worry about this at all. You are over reacting.
Use an idiot light from a 70 Mustang from the "engine hot" sender to turn on the cooling fan for the oil cooler.
It is set at 212.
Put a Mocal oil thermostat in line to the oil cooler. There are two temperatures available. The standard one is 180. The high temp is 200. Use the high temp.
If this car has the Aviaid oil pan, with the oil cooler, and the additional oil in the lines to the cooler, the oil will NEVER get hot unless you use these thermostats.
Over cooling oil in the long run is damaging to the engine.
It has to get hot.
Many race cars these days are using an oil heater to bring the oil temp up before they rev the engine.
Long stroke engines are the hardest on the bearings and the oil can not be cold.
I am using this thermostat with -10 lines and a dual remote filter. My system takes 12 quarts. That's a lot of oil.
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