Only 12k miles out of a PS4S? That seems very low. Are you basing this on somewhat often burn outs and digs?
315/35/20 PS4S saw 20k miles on the PS4S before it starts to loose rain efficiently. Dry traction still good until 25k but I took the camber out of the rear end so they wear evenly.
I got 6k miles out of my NT555rII this summer and they have about half tread left still. Did very well I’m the rain for a drag tire. Never took it over 70mph during heavy rain though. I definitely fall into the race things on the street category. Full summer of bing challenged at lights, highway runs and trying to beat my brother in laws trackhawk from a dig lol
I've had the PS4S on my C8, as well as my 2018 T/A 392. I didn't use them on my Hellcat. I ran PS All Season 4s on my 2020 Hellcat. The PS4S lasted 14k miles on my T/A. They were down to 4 32nds on that car. I never raced it and it lived its entire life as a commuter. I put 10k miles on the C8 and it was down to 5 32nds, so wear was very similar. Now, the 2020 HC's all seasons were still at 8/32nds when I sold it and that car had over 25k miles on those tires.
Overall, I really don't like drag radials on the street unless someone has a backup set for actual track work. Irregular road surfaces chew up DRs and make them irregular. When you take a street driven DR to the strip, it behaves not much better than a standard street tire due to the irregular wear. Hence why I say you really only get a couple thousand miles out of a DR. Yes, they still have tread, but the irregular wear makes them no better than a comparable street tire, only they have a soft sidewall and poor cornering and inclement weather performance.