I could have told you that the 12mm would rub in the rear for sure with the 275/35/19 with a mild drop. I have experience with running 10mm spacers with 265/35/19 ad08 on my zcp wheels in the rear and it has a very slight rub on huge deviations on the fwy when the suspension compresses completely.
For the fronts, I ran 255/35/19 ad08 + 10mm spacer with a 1.5 inch drop (kwv3) and it rubbed at 3/4 lock both left right. Its super hard to run aggressive tires on this car without rub on a stock alignment.
I ran ad08 255/35/19 F + 10 mm spacers and ad08 295/30/19 R + 0 spacers for about half a year and I got so sick of the rubbing I just ended up getting stock sized ad08's and I've been quite happy with the grip and performance.
Peanut Butter Chunky
AD08. Akra. Huper Optik. KW V3. Macht Schnell. RE SSK. TMS.