There's a few things you could do. I'll name the top 3:
1) Bigger oil cooler with thermostatic sandwich plate
2) Bigger oil cooler with thermostatic sandwich plate
3) Bigger oil cooler with thermostatic sandwich plate
Once you've completed all 3, get a good tune (unless you already have)
As far as the cause for higher temps? Could be your driving habit. Have you been keeping it in higher revs than normal just to enjoy the sound? When I first got my exhaust custom modified, I had the same issues until I realized that keeping in higher revs (3.5k-4k instead of 2.5k or less), my oil temps SKYROCKETED. Try going for a short drive while maintaining over 4k RPM. You'll see that needle climb
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