Check your tire pressure. Mine is supposed to be at 28 psi, but the tire shop cranked it to 40. It was riding like a skateboard until I let out some air.
If that doesn't work, Michelin makes some of the smoothest riding tires.
If you go to discount tire they should offer you good options.
Another option is to find somebody who wants to trade for your 17's. 16's (with smooth tires) will ride even smoother at the correct pressure.
Good luck.