Sounds like a good solution.
My little car (Focus Zetec) has hard-ish suspension and normally 195/55 (R15) tyres but for winter has 195/60's which are definitely softer despite the minor difference of just a few mm.
The speedo is now more accurate but still underreads slightly.
(next spring it's going up a rim size to 205/50/16 so I'll see what that does to the handling)
I haven't done much driving in the S8 with the winter setup yet, but anticipate similar effects - I'll know tomorrow as we're out in it all day.
The rubber difference is more (and speedo virtually identical) though as I also reduced the rim size: 225/55/17 from 245/45/18
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