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This just in- are you certain you didn't have the old tstat installed backwards?

You might consider getting a hotter tstat of the same mfg/type.

I've seen posted here that below 180 will cause sludge build up.

It's actually a cheat, but you could add an oil cooler.

Summit has some nice diverter kits which mount under the oil filter, and have a thermal bypass to bypass in cold weather.

Personal experience says: have the radiator serviced.

It's fairly common, the radiator is a little plugged up, and cooled the motor fine, but then you went and rebuilt the motor, and it now makes...