I might get a second opinion on that alignment. If they screwed it up that could account for what you're feeling.

 

I hope that you changed out all four tires at the same time. Years ago when the rear PZeros wore out I replaced them with Conti DWS tires. At the time I was strapped for money and thought to wait until the front PZeros wore out before replacing them. What a mistake!!! The rear end would go every which way! Once I replaced the front PZeros with a matching set of DWS tires everything was perfectly fine with a quieter & softer ride along with a wee bit softer handling. And rain/snow handling was much improved.