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My 2010 RX 350 has 35K miles on it. The last several months I've been finding the ride starting to get rougher...able to feel even the smallest of bumps. I recently replaced the tires with the same OEM Michelin Latitude Tour HP thinking I would see an improvement. I had to bring it in to the dealer today for a brake inspection, and indeed, the front brakes needed to be replaced. I was given a 2013 RX350 as a loaner. The difference in the ride was night and day. The 2013 was vastly smoother. Should I be looking at some other cause like suspension, bushings, etc. as the cause for the rough ride?