Completely normal. A run up to high power setting will increase oil temp by quite a bit, and thus reduce viscosity.
I kind of doubt oil temp only went up from 170F to 180F. Usually at high power oil temp is more like 190-200F, but that depends on how long at power and where you are measuring the temp. I don't think the QSB from the factory has an oil temp sensor, so probably some sort of aftermarket device.
I've sea trialed many of these and the posted numbers are typical.
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