May sound stupid, but...Have you tried flushing your system and adding Water Wetter? If you live in a place where you won't see freezing temps, you can run more like a 70-30, 30 being anti-freeze, and add a bottle of water wetter. It lowered my temps by about 15 degrees. But, if it's a aluminum rad you want, don't overlook Fluidyne. I've had no problems with mine.
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