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Oil Temps
I think you need more investigation before you start obstructing the oil cooler. Is winter weight oil being used or a multi-grade? Where is the oil temperature probe located; cooler inlet, cooler outlet, someplace else? There is often a large temperature difference between the temperature at the probe location and true temperature at the outlet of the engine.
Also interesting ....the highest oil temperatures occur post landing!
CHT Temps
I agree, I'd be concerned about the CHTs. The cylinders are big chunks of finely machined metal and need several minutes to cool down. After take-off, climb and transitioning to cruise, I'd suggest taking more time before leaning and closing the cowl flaps.
The rear engine is showing a large spread of CHTs, which results in a large variation in fuel flow to each cylinder. Cleaning CHT1 injector will result in more fuel flow, and will decrease CHT1.
EGTs
EGTs are showing good combustion on on cylinders. There's a wierd behaviour on front EGT2 (temp decrease on start-up???).
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