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I run et38, same as 172 cups, on my 172, which is lowered on coilies. Sit beautifully in the arch and don't rub.
Although, IIRC the 182 cups/cupped pack (don't know if yours is either) have wider track via the difference in hubs so may need to check that first before going to a smaller offset.
I spoke to Team Dynamics and they told me i should get et38 for my 182 even though et43 is available and closer to the standard 45 due to brake clearance!