Every engine that I've ever checked would lug if overpropped and revup if underpropped.....yes they all do respond the same. When propping for maximum speed, the plane doesn't care what the powerband of the engine is, it is only looking for maximum rpm from whatever prop is matched to that airframe. I guarantee if you are only propping for the advertised powerband, your engines might last 30 years but you will never see what that engine can really do.