As of this writing, Cylinders 1-4 are all within 2 degrees of each other in cruise flight. Awesome. However, Cyl 5 and 6 and still too cool due to being right up front. I've managed to raise the temps a bit using covers on the heads but haven't tried covering the exposed cylinder fins until today. Both 5 and 6 got taped off, and 2 plies of pre-preg glass. Tomorrow they will be trimmed up and bonded on with RTV like the others. I'm getting closer to having a 6 pack of balanced CHT's :)