I'm not talking about "satin" (matte) black like GM drivetrain components. I'm talking about "semi-gloss" black, which still has a sheen (1 step below gloss).

Regardless of what you call the paint, if you want to duplicate the look of new OEM steel wheels, they should not be as "glossy" as the exterior of the car. Because painters are more careful in application than the factory, this usually involves a little flattening agent.