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Peculiar indeed.
Initially, I thought 100% pad issue - not enough heat/too aggressive. I know nothing about those pads, but I have a gut feeling that it is not fluid related and that is the type of thing that people bitch about when they have too aggressive a pad. But, since you know someone else running those pads, perhaps it is interface based.
Everytime I've heard of brake problems involving fluid, it involves pressure differentials. Too soft a pedal; need to pump; goes to floor; etc. Rarely do I hear that the pedal is solid, but the car doesn't stop. The only connection I might see is if the pedal is going to or near the floor. Obviously, there is an area of free play, bite, then bottom. If those are in about the right place - I'd think the hydraulic system is fine and it is a materials problem.
As for the scoring on the rotor - I don't know enough about those pads to say, either way. Scoring will definately reduce your cold brake stopping power, but does lessen as the pads get heat. I noticed this when I went from track pads to street pads on rotors that could double as a warped record. They sucked until they got hot... but not too hot.
I think you've made the only diagnosis I can think of.
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