Thank you for the feedback guys. The tires that were originally on were Dunlop SP Sport Maxx and the new are Continental DWS. Size didn't change, 275/40 R20 in front and 315/35 R20 rear.

For some reason I never thought the actual tires could be defective, but I suppose that's a distinct possibilty. I wonder if the guy will actually replace the tires or whether I'd have to threaten a lawsuit if he doesn't. I really don't want to go through that crap, but fact is...and what I keep coming back to in my mind...everything was fine before the new tires. So frustrating.