Dr Diff FORD rear disc brakes....What replacement pads have you tried?

I have The Cobra Rotors on the rear of my '64 Dart. have not replaced the pads (stock from Cass / Dr.Diff) in ~20,000 Miles of spirited mountain corner carving , autoX, trailer towing and 1 Track Day session. I am going to try EBC Yellow Stuff for the rears next. We have Run those for 8 hours straight on the Front of the Lemons race car (Single piston MoPar Calipers) and they work well.