BrianM; sounds like you got it all worked out. How were you measuring your water temps? Also, Didn't you experience heat soak? Maybe the meth helps a lot.
It sounds so different than my experience but I have an AT.
Anyway, I look forward to where your aero package ends up. I've given up on the 335 and am working on an E36 M3. It was just too fragile for me. Maybe I'm a thug.