220- 230 is not especially hot. If it were creeping into the 240 - 250 range during normal driving, I'd be a bit more concerned.
I say try the ARC cool fins first -- search for threads by me on here with details. Inexpensive and effective for dropping temps by 10 -15* F, which is plenty to get you into an optimal, but not over-cooled range.
I honestly do not see the need for an oil cooler unless you track the car OR see temps shooting up into the 240+ range regularly.
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