More tire stuff...

[the Spaeth's]

I put the summer tires on our 20v Avant and they seem to have a real 
tendency to follow the valleys in the road. They are Bridgestone Potenza 
SO3's in 235/45/ZR17's. Is this usually a component of tires or 
alignment or some other issue? The car has stock springs with Koni 
adjustable struts. I have some H&R springs waiting to be installed. 
Would the springs help this at all? It is not really unsafe but it is 
very annoying. The wife is not liking it at all.

thanks
Craig
the Gorge