OK, at last I've got my 17" pseodo-avus winters on my S8 so here's the comparison:
Summer, Avus 8J*18 with 245/45 R18:
Winter, 7.5J*17 with 225/55 R17:

The centre caps are supposed, I think, to have a dark ring in the dish, but I decided to spray them the same colour all over to look more like the summer ones.
Well pleased with the result.
No problems with the front brakes, I can still slip a finger in the gap.

(Note to self - call insurers to let them know - Edit, job done, supreme disinterest but noted with no change of premium)
And sorry about the photo quality; taken on 2 different camera phones.