Hey Rob, long time...
I would say go for the 17". IMO the "mechanical grip" that u were told about results in much more deflection on the tyre it self allowing more suspension movement that in turn results in incorrect angles (at the extremes).
personally i really like the advan a048 very much that also comes in the 225 45 17 dimension u specified.
if u look carefully for tyres u should find a rolling radius and section width dimensions which are useful to calculate final drive ratio changes and clearance in fender/ suspension
Chris
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Aircooled 4ever
1973 1303 going towards GL
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