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Ivan, I believe the wheel offset determines the position of the tire, not the wheel width. It's true that a 9.5" wheel will stick out 0.5" more than an 8.5" wheel, but the wheel will be centered at the ET of the wheels.
I mention this because it appears that you are trying to reduce the ET by 5 in order to compensate for a 1" narrower wheel, but I don't believe that will do it.
If you run the two wheel widths on a wheel/tire calculator with the same ET and same tires I think you will find that the tire is sitting in the same position. This has been my experience as well.
I've been reading wheel/tire posts for 4 years on 1Addicts, and although I have high-offset Apex Arc-8 wheels with 275 width rear tires, it seems that a 48 ET is about as low as you can go without rubbing on stock sport suspension with a 255 width tire.
Just my 2 cents... good luck.
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