Installing a front airdam will make the radiator do its job better by the vacuum under the engine, helping expelling hot air.

A half-filled engine block might need a bit more help to keep cool when working.
What's the ignition timing at those rpms?
Do you run a vacuum advance?

The electric fans could indeed work as a blocker at higher car speeds. But that would mean the radiator is 'marginal' at best already.

210° leaves hardly any margin for error in case of mishap.
I never want to see 190+ on any my engines. I have one car borders that number, but it's engine isn't optimal.