If you are flying a 182 wheelplane, and you're approaching exceeding a CHT limitation, I cannot imagine what you're doing with it!
ST, how about using a 182 for glider towing at 65 mph with an airfield DA of 5500'?
Last summer during a hot spell with temperatures over 30 C, we often approached our club's max CHT when towing heavy two-seaters. Going from memory, I think it is 315 F and the absolute maximum is 350 F.
The remedies, in order of application, were: speed up to 70 mph, go to full-rich and lastly reduce power.
While I enjoy the challenge of operating the 182 efficiently, my opinion is that it is not very suitable as a towplane, partly because of the engine-management issues, but also because it takes longer to get airborne than our Scout towplane. This has led to some marginal departures when towing our two-seaters.