>The goal being to climb at that same rate, but get temp to drop.
The goal, if I were to do these tests, would be a lot more complex. Just reducing climb temp would be easy. To know I have actually improved anything I would have to test that no other flight regime were adversely effected. ie reduced max speed, increase fuel burn at the same cruise parameters, etc, etc.

>At some point you have to say, "Good enough" and be done with it.
My thoughts entirely. I haven't changed a thing on the cooling side since first flight. I've flown at 269 mph triangulated ground speed with power left over, taxied  for over an hour at 96f oat and climbed at > 1500 fpm on the same day, flown safely from FL to RI and accumulated 87 hrs on this cooling system. As they say in poker, "I'll hold 'em".

Maybe one day, when I'm bored and the weather's bad, I'll tweak things a little.  More likely we'll look for "marginal" improvements while replicating my installation in Chad Robinson's Cozy.

John