It used to be if you could snag a fingernail on a groove, it had to be ground down. If you don't like the grooves, you may be able to wet sand them with some 400 grit sandpaper. Then switch to organic pads like EBC:
http://www.ebcbrakes.com/mb-streetbikes.html. They might be GG-rated, but that's OK for the rear. Stick to HH-rated for the front.