Here’s an idea - keep the sublime handling of the 21s with a set of tires that last twice as long, perform just as well, are just as quiet, and cost half as much.
I’m on my second set of Hankooks, and can’t praise them enough.
Search the forum, and you’ll find other satisfied users.
Rear: Hankook Ventus V12 EVO2 275/30R21
Front: Hankook Ventus V12 EVO2 245/35R21
$1000 for a set of four. Sweet!
They wear much better then the PS2s - I get over 20,000 miles per set on my rears, and 30,000 miles on the front.
I got tired of paying $1000 for a pair of rear Michelin PS2 rear tires which only lasted 10,000 miles.
(But that's the joy of a P85+!)
Good luck!