Volvo Repair: Fix for rain groove shimy?, pirelli scorpion str, mercedes ml320

Question
I recently (1200 miles ago) purchased a 2004 V70XC and have
become frustrated with its handling characteristics whenever I'm
on a stretch of concrete Freeway that has rain grooves carved in
it. The wagon came with Pirelli Scorpion STR's on it.

The dealer's service dept. says the fault lies with the tires as they
are M&S and a reputable tire shop says that this model shouldn't
have any problems unless they are over inflated. Mine are at 33
psi.

Prior to this I've owned M&S rated tires before, none with this
problem. I've had Generals on a Mercedes ML320 and a Nissan
Pathfinder. The Pathfinder also had Bridgestones, Goodrich and
Kelly's in its 14 years of service. My wifes BMW has Conti's and
so did my old VW Scirocco.

Has anyone a solution to this shimy? It is so annoying that its
making me sorry I didn't get the Saab wagon.

Didn't I test drive it? Yes, but wouldn't you know it, the freeways
where I tested it were smooth asphalt!

thanks in advance,
Ed

Answer
I have not heard of this type problem.I will check into it and see what I find.you may be able to try another set of tires.I would see if the dealer could swap out these tires for you.the pirellis have a very agressive tread pattern and do ride hars.also they ride worse as the edges begin to feather and get worn.