Well I think it's safe to say these were the original brake pads and I feel so ashamed that I never checked them out sooner.
I got Powerstop track day pads since Rockauto saw fit to stop carrying the Centric/Stoptech performance pads. I am pretty impressed, they came with new sliding pins, clips and grease, although I reused the stock pins after wire wheeling them because they were shorter than the replacement pins and I didn't want to see them poking out of the caliper.
That's one of the rear pads, I didn't get a pic of the front pads but they were at around 3mm left.
I swapped in stoptech rear braided lines and bled the system with Motul 600.
After bedding them in as per instruction I am pretty pleased so far, nice bite when cold and no noise. I noticed quite a bit of dust after the bedding procedure so will keep an eye on that but I can't expect them to not be at least a little dusty given their intended use.