Had a problem this weekend with a new set of Hoosier vintage treads...car was fine during Friday practice, using up an old set of Dunlops. For Sat quali session, we put on a new set of Hoosiers---big issues. They are great everywhere, except under very heavy braking, then the fronts get a bounce/shudder going that will almost take the steering wheel away from you. No hint of it any other time, so I don't think it's balance or out of round. Not the track surface, he was in the same line as with the D's, and trying another line didn't help.
Great tire otherwise,