Your engine issue could very well be vapor lock, which is not really a coolant/cooling issue.
it could also be a $20 ignition coil that exhibits problems when heat soaked.
210°, 220° is not really an issue. And of course, unless you have installed an aftermarket gauge and matching sender there is absolutely ZERO chance that your stock gauge and sender are displaying the correct temperature, in the first place.
if you can heat soak your engine block on a high temperature day, usually when stuck in city traffic, and then park your car, walk away, and not have any boiling or gurgling noises and there is no discharge of expansion tank coolant, I don’t think there is an issue
Ford actually had a technical service bulletin advising dealers to install a resistor in the temperature gage wiring to electrically lower the temperature displayed. Like you, many owners new to a car with an actual gauge were concerned about “high temperature”, when everything was working just as intended
please don’t start going down this rabbit hole based just on gauge readings, not supported by any real-life coolant boiling or loss issues.
Larry