So, what seems to be the problem? These temps sound excellent to me.
You don't want your oil temps to go beyond 245F, and ideally have them in the 185 - 210F range in cruise flight. Any cooler and you'll have moisture collecting in the oil, the oil being too thick and therefore less lubrication.
I'd say just fly the plane as it is!
Hilversum, The Netherlands
Preparing to build a Rocket
PH-BRR Bowers Fly Baby; Imported and upgraded
PH-MGA Jodel DR1050; Built, with Subaru EJ25
PH-SUM RV-4; Imported and upgraded. Sold my share :-(
PH-EIL RV-4; Imported and upgraded for friend. Sadly crashed
PH-ERD Robin DR300; Built with Subaru EZ30 for friend.