Get rid of that 160 t-stat and put in a 180. The 160 t-stat is not allowing the anti-freeze water mix stay in the rad long enough to cool down. Trust me I have similiar set-up with same problem. I switched to 180 t-stat and my car runs 180-190. Also you may want to try more water versus anti-freeze in the mix. But don't get carried away if you live in an area that experiences cold weather.
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