Thanks, JBW for your ideas.
Toolbuilder- Running an Aerosport Power '540, D4A5, with the oil cooler aft of #6 cylinder, angled back about 20'. I've had a few aerobatic machines and worked them hard in airshows, but am just not used to the temps with a Rocket. I've been advised that its just the nature of the beast. Using Exxon 20-50 with a pint of Camguard. On a hot day I'll see 235 on the oil temp and the hottest cylinder about 400. I know this is within limits but would be more comfortable with a bit lower temps, if for nothing more than increased longevity. Thanks for your input.