Your new road bike sounds glorious. I know what you mean about whizzing down a hill and trying to keep speed and bike under control. Sometimes my start position on a descent will be on the flats so I can bodily catch more air to slow, as I gain more speed I get into drops to use brakes more effectively. Feather your braking on a descent to have more control. I'm just a pokey cyclist, still learning and am sure many great cyclist on this board can help you.