Manny, rebalancing will be my first step - I'm a little suspicious because one front wheel has no balance weight on the outside. That's scheduled for wednesday.
Duke, this is mild shimmy - but unpleasant. Just a vibration felt at the steering wheel, where there was none with the old tires. Nothing suggesting it might get worse, but I don't want to ruin brand-new tires. Maybe I'll slip off the damper tonite and check it.