High CHTs - Dual Radiator in Series ?

The 50/50 Dexcool should do the job.  But, I’ve also discovered a second defense, if and when engine temperatures start soaring (or the red warning light has already started flashing): managing the hottest-EGT reading via the EIS. First, I reduce AOA (if climbing) and throttle back, until I find the “sweet spot,” where hottest-EGT drops rapidly (i.e., 5-8 seconds) by at least 25-50 F degrees (or more). I move the throttle around (usually down, but sometimes up) and select the RPM that gives me the greatest drop in the hottest-EGT! Usually, this “sweet spot” exists around 4,800- 4,950 rpm. I hold it there and I soon see engine oil temperature and CHTs dropping dramatically too, in response to “less work” (thus less heat) the engine is doing. And if throttling down does not yield a sweet spot, I always remember to try going up. I’ve found the hottest-EGT sweet spot to be a very effective way to help manage high engine temperatures in hot weather. Just my 2 cents...