I agree completely. Two of the Bridgestone OEM tires that came on our new car we purchased last year had high road force values, causing a really unpleasant feel on the highway. The dealer(s) wouldn't touch it, and always seem to not know how to handle tire related issues (which I personally find to be unacceptable, as a former dealership service writer (non-FoMoCo). I popped into my local Firestone, and they not only replaced the tires, no questions asked, no fee, but they upgraded me to a higher-end Bridgestone with a longer tread life at my request, for no cost.
I, as someone who's been on both sides of the counter for these types of issues, would advise that you contact Hankook. In the case of a treadlife issue, there may be only a prorated credit awaiting you, but that's much better than paying full price. I'd be extremely surprised if they didn't refer you to a local Hankook dealer for a tire prorate evaluation. I'd actually sort of recommend Sears Auto Center if you've got one near you. Their POS makes it really easy for them to do an accurate proration, and that would also give you some history with them if you ever need warranty tire service when you're travelling, versus a small independent shop. I'm assuming they still sell Hankook, of course.