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ConnClark,
It's the other way around. RRC is mostly dependent on how much material you are flexing. When a tire wear, there is less material to flex (lower hysteresis losses), and for a fixed pressure, RR goes down.
The same thing happens when you raise the pressure. The tire is being held by the air pressure inside it, up the pressure and less material is flexing while the tire is rolling.
Same thing again when you are driving on a rough road.
I do not think harder compound reduces RR. Because the material is still going to flex, as air pressure is the predominant factor here, and since it's harder to flex, hysteresis losses are just probably gonna be greater.
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