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That's good news. I recall doing a t-stat swap along with cooling system maintenance, and the circular gasket was basically heat-glued to the upper half of the housing and it had disintegrated such that there was rubber scum floating at the radiator cap. Several coolant flushes later (and a...

Cavitation of that air is not good, but by doing the burp, doesn't that essentially eliminate the air in the system, and then closing up the top of the radiator (overflowing when burped), then maintaining the overflow bottle such that no air gets drawn in solve this?

Yes, fan clutch is more of a stop-and-go city driving cooling assist. Good to be cautious about the concern, but it may just need some time to work out the air bubble at the sender? Oh, jeez, just thought of this, the circular gasket that sits atop the thermostat- really shouldn't be a factor...

Good to be concerned about it, but maybe not a major issue, freeway speeds, and free flowing air thru radiator would rule out fan clutch; is the radiator suspect- no clogged fins ?

What Cody wrote ^^ is what I thought as well, air bubble; run it at operating temps with the heater on, check coolant overflow bottle for drawdown and refill. Is the radiator cap OEM and still working properly?