The noise when slowing down is more than likely the tire size difference in the front. Found that out when i got lazy and only reinflated the rear tires and leaving the front low. On the drive home i started to get a pretty bad "whine" and slight thumping in the front. Went away as soon as i reinflated the front tires to prefered PSI, considering they where 20psi flatter than it should have been.