Wow, your Suburban looks exactly like the front rotors on my Vette, (two piece racing rotors) after it was tracked with track pads. My main challenge is when daily driving it - the pads never get up to temperature, and the Stoptechs are too mild at low temp.
Your Silverado has a nice transfer layer, something I just can't seem to maintain with these Stoptech pads (with both cars). Never had a problem before, with various semi-metallics. I blame the "para-aramid" material Stop tech uses, are you familiar with this material at all?
My experience thus far with aftermarket pads: it's easy to design a pad for high bite at high temp, or high bite low temp, but almost never BOTH. The OEM pads on both my Intrepid (police package) and Z06 excelled at BOTH. They can easily ABS sticky summer tires at reasonable speeds, and still be fade proof on any mountain road. Downside? Both near $300 for a set of front pads :(
For the Intrepid, I just bought a set of NAO pads from Raybestos, which promises very good low temp bite (FF pad), but relatively poor at high temp (like all NAO pads). That's perfect for daily driving. I'm hoping this will be aggressive enough to keep a nice clean transfer layer on my rotors.