O.k, so everything in life is a trade-off.
The smaller tires will have more revolutions per mile, if I read the calculators right (I don't know the first thing about tires).
So, in theory, they would wear faster. I do recall back when I was riding my Honda Helix scooter and later an Aprilia 500 Scarabeo scooter, with their relatively diminutive tires, they would go through them fast.
Presumably, the handling characteristics are sufficient off-set (read 'trade-off') for the added wear, unless of course, Michelin is magic, and their Commander wears better AND handles better. I do know that when the dealer changed the OEM tire on my daily commuter Honda CTX700D for the Michelin, it was a near night and day difference in favor of the Michelin.
You see where I'm going with this. If I have to buy five Michelins for every Metzler, then I'd be looking as others have at the Excedra Max and Avons.
I really appreciate your sharing your experience with us.