The first big line between 160 and 210 is 190-195 degrees, it was the same way on my car. It always stayed right around that mark. Not something to worry about like you said.

If you can't find the oil leak/seep. Try degreasing the engine with some purple power or simple green, wash everything off to remove any oil films. Drive it around for a day or two and start checking over everything to see if you can find any new seeps/leaks.