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Single-piston floating calipers depend on the distortion of the square-cut rubber ring to retract the piston ever so slightly, a small amount of disc runout helps...by nature they drag more than calipers with mechanical retractors.

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This is exactly what I'm dealing with. Everything is new. Except for the calipers. They are NEW, in the respect that they don't have much mileage on them, but have been on the car for several years. I drive the car, maybe 1K a year. You see where I'm coming from??
I have heard that the Square Ring seal on the piston may cause an issue like this, but kind of discarded that thought because of usage.