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Mike,
I run the 180 and it seems fine. Running temp is in the 190-210 range. I use a 16lb cap.
What temp the engine needs to run correctly seems to be a 6-beer discussion, so just my opinion that the 190-210 range is fine.
I do put a small hole in the flange of the thermostat to allow air to escape even if it isn't open. 3/32 is probably OK.
If you want the fan(s) to run less you might consider adjusting the on-off temps a bit. Mine come on at around 190 and off about 180.
Tom
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Wells's law of engine size: If it matters what gear you're in, the engine's too small!
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