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I thought of worst case first (head gasket), but don't see any contamination in either the oil, or the coolant, nor anything goofy like burnt coolant out the exhaust.

I've heard that the plastic impellers on the stock water pumps can spin on their shaft. I wonder if this one is spinning at rpms above 1200-1500 rpm, then when revs drop, it quits slipping and is able to move coolant again, explaining the quick drop…

Ended up being a water pump impeller that was slipping on it's shaft. Visual inspection of impeller showed it to be cracked and about to shrapnel itself.

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