Josh - FWIW, my CHTs were running a little high and it troubled me. I have a 912ULS of course, so it’s a little like comparing apples to oranges. Anyway, I ended up gluing a piece of thick, red silicone foam rubber to the cowl directly under the radiator. It’s then compressed slightly to form a good seal and prevent air from taking the path of least resistance and flowing under instead of through the radiator. My temps dropped considerably.

Stacked coils are common on cars of course, but the condenser for the a/c system, which is generally in front of the radiator, is usually a very thin coil which presents minimal affect on the radiator’s operation. I’m not a big fan of the way those particular oil coolers are mounted in our newer Kitfoxes, but as others have said it does usually seem to work. My oil temps are very good under all conditions, but it’s a shame to have to pre-heat the air entering the radiator.