Owner of the MSNSPS
I know what you were saying but obviously wasn't clear in what I was saying - sorry.Not sure what you wanted to say in the first paragraph.
He has +12 offset which is the same I had once, and we were talking about the clearance with the fenders. Inner isn't a problem in a R32 until you're going 11J with 295 tires.
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But the offset IS the problem. To stop the tyre from touch the arches you need to 'pull the tyre in'. You can do this with narrower tyres OR you can just fit wheels with a 'better' offset. You can run a 265/35R18 with an ET20 as many people here do.
IMHO a 255 section tyre is too narrow for a 9.5" rim and even worse on a 10" rim. I would say you'd be better getting either a 9" rim or a wider tyre. However, I'm aware that some like the stretched thing. It may also be the case some some 'wide' 255s would be fine.
My thread (linked in my signature) has some pictures and measurements showing the actual width of some 255/265 tyres. Some are 10-20mm wider than.
For example these are 255 section tyres: