Tons of black dust? Raybestos

Now that my Duster build is complete, I’ve been driving it a bit. Got the brake thing sorted out with the rear drums. Seems ok now. However my RockAuto Raybestsos
SGD84M pads make tons of black dust. I’ve never seen anything like this before. At first I thought the calipers were hung on to make this much dust. You can brake pretty good and pull over and the heat is about what you’d expect. Took it for a 20 min cruise and barely even used the brakes and I’ve got black dust on the wheels. Almost no heat. You can touch the rotors. I’m thinking about switching pads. This is fairly strange. I knew going in that my body colored BlueSky wheels would see dust, but yikes. Here is a 15 min drive with almost no braking. No heat involved either side. Strange.

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That is excessive for what you discribed. You didn't say if the rotor was turned or replaced as I suppose some break- in will create more dust. The culprit is likely pad quality though I'm not familiar with the pad you used I can say that from my own experience when it comes to the auto parts chains I'll only use ceramic pads. All the others make too much black dust.