Got the water pump underdrive pulley installed easily, just bolted on like stock. I've done some logging too, good temps while cruising around (180F stable with AC on, as usual) and temps so far are better at autocross. They still recover super quickly too and I'm not seeing as wild high temps. I used to see 217F at the end of autocross runs, I've done one event and I'm only seeing 205F as a peak on course even with a lot more rev limiter action at 9800 RPM. No more autocross events planned this year for me, sadly. Might get to do a track day or autocross, unsure though!
Big thanks to Dennis at HGB Motorsports for the pulley and hand delivery at nats!