+38 is perfect for 16x8. You wouldn't have to roll your fender depending on your ride height.
If you can find 225/45/16, that would be ideal as it's only a 1% difference compared to the size size.
It's not an exact comparison, but here is mine with 17x8 +38. Lowered a little past .75" with 235/40/17 (no rubbing). Fairly flush with -2.5 up front and -2 in the rear.
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