Hello Adam
I use the Paint Correcting Polish after clay bar on every car to remove the swirls and washing interference type scratches and on a driver car you can get away with just using the Paint Correcting Polish.
Most of the cars I detail are high end show cars, customs or exotics and I always use the Paint Finishing Polish and the Cyclo on 6 and I find that the finish comes out even better with a higher shine and flatter surface finish. That extra burnishing step before the Paint Sealant or Paste wax gives it an extra hit that makes the depth and clarity just a little bit better to me.
I am always looking for the best result. As to me you are only as good as your last detail job.
Great Products !!!!!