1) 8AI have three questions for bifft:
1) Which model RV do you have?
2) Is it fair to say you would really like to have your CHT's 30-40 degrees cooler?
3) Where exactly does the main cylinder cooling airflow exit your engine cowling?
I've spend lots of time reading those threads. Have checked my baffles as best I know how, haven't measured delta p. (not keen on cutting more holes in the firewall). Did my best on setting ignition timing per the marks on the flywheel, but again, don't know how good my best is. Run the mixture full rich for takeoff, running it rich at other times means my plugs clog up fast.VAF has many, many threads on cooling issues and if you have not checked them out its usually a combination of little things that kills you:
Poor Delta p (leaking baffle seals, gaps in baffles, leaking inlets)
Bad ignition timing
No bypass ducts on cylinders 2 and 3