BruceK
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Swapping thermostats involves removing the header tanks they sit under.You'll probably find out more by swapping the two thermostats.
Or just replacing the low reading thermostat.
For me, one engine reading high turned out to be just the FB wiring.
ADC may recommend replacing the raw water pumps with an updated version that does not have the drive fail without warning (about $500 each).
There is a metal tube in the header tank which blocks up and needs drilling clean. Probably unrelated to this.
Sometimes concentrating on trying to help we get a bit "direct'. Rarely someone actually gets nasty, that`s not happening here. Exasperation with a problem can be sensitizing too. I hope you solve the problem.
Detailed discussions about correctly pronouncing "pedant" can be had.