Normally boggo pagid rears for me, on my r53. I guess 2-ish track days new to death.
for some context with the jcw roadster the oem pads and discs were rusted/pitted from new (to me) at 3k as the car was most stationary for 5 years, 2011- 2017 so 5+ Bedfords, 1/2 day at rockingham, 2 x 30 minutes at Silverstone, curborough etc
over 8k it never cleaned up the rear face, on original parts, all by running xp8 on jcw calipers up front end and ate 200 fluid.
upgraded fronts over the summer with gp2/Bmw 135i calipers with brembo pads. And rear last week with pagid disc and pbs pads, will dig out some pictures later this week, wish I had measured thickness to compare, no idea on the fronts as buried in calipers.