I really don't mind the tramlining and bouncy ride, it just surprises me how much more noticeable it is. I thought I might not have torqued the lug nuts on one of the wheels or installed my brakes wrong it was wondering so much. Then I just remembered it was the tires
Yes, my summer tires are 225/50s and they are Good Year Eagle F1 GS-D3s.
I still need to fix my tire pressures, I rotated them front and back. And originally I had 26 psi front and 32 back (or so, whatever book recommends) and now they are 32 front and 26 back, so I have a little more oversteer, which I am sure is amplifying the tramline effect and making the car feel more squirly.
We have a Mazda3 with 17" wheels and it rides fairly smooth and doesn't tramline much. It also has narrower tires (205) that don't feel quite as stiff. My only complaint with that is it makes for expensive tires on an "economy" car.