[Mr. Merk]

Not my tire—just a close-up of the sidewall indicator on yours.

I usually run R888Rs or A052s and tend to keep cold pressures in the low 20s up front and high 20s in the rear.

You already noted the stiffer sidewalls, which means they don't need as much pressure to support the car. I wouldn’t be surprised if you could drop another 5 psi and still stay above the triangle wear indicator. Just keep adjusting until the wear line sits right at the tip—that's usually the sweet spot for both ride quality and maximizing tire life.