Feedback:
Clear coat issue... kinda weird, haven't seen that one before, and mine is parked outside (not that Seattle is real sunny)
Spidercracking on the interior door handle... every one I've seen is like that, usually seems to be worse on the passenger side, which is odd, but normal.
18s are better than 19s if stock, only the 19s on the competition coupe are light enough to not be a big effect. Supposedly going just from stock 19s to stock 18s and losing the runflats gains big time in the 1/4, and even some 0-60.
Sport mode basically maps the pedal 1:1 with the throttle. With sport mode off, the first 30% of the pedal gives you 10% throttle, next 20 gives another 10, etc. It basically blunts the first half of the throw to make it easier to drive in traffic. With sport on, it touchier and feels faster. From a light if you mash it either way, it uses all the power, it's not a different engine map or anything.
The rear ends are clunky, it's a known thing, takes a while to get used to. An aftermarket diff that isn't electronic makes that go away I've heard.