Re: racetrack tire choice (hearing8)
Michelin schlicks!
I'd use Dunlop as well, but I like the underdog/overdog dynamic, 'cause here Michelin is a fat smelly monkey tire to some, and on the world stage, they're as liked as a 'free beer!' sign.
At my level, it may not matter that much, but I've always had strong confidence in Michelin. You should beware of changes to a bike with different tire brands. The Pirelli and Metzeler's may not be night & day different on a bike's suspension and set up, while Dunlops-Michelins or Dunlops-Pirellis are. Of course, you might not spend much time on setting up a bike.
I do believe even amateur racers can feel differences in brands of tires, and but it's more of a matter of whether we can adjust sufficiently to a tire's characteristics, of heat up, traction, breaking of grip, sliding ability, how they perform under braking (how the sidewall handles that), etc.
The sad thing is, the big dogs get the exclusive Plutonian compounds, while we schmucks get a violent, cold slap in the face, a bill for $350 or $400, and a cackling tire salesman who points at us and says "You're NOBODY!! Go around that racetrack on your pee-bike, and try to FEEL like DuHamel!" *
(*Your rider of comparison may differ. I've aged only somewhat gracefully these past few years...I counted three gray hairs on my goatee this AM...)