The RS06 is an amazing tire. Great grip and much improved longevity over the earlier versions. 3 race weekends is very doable.

I say that knowing nothing about the Hankook, since our local vendor does not carry them and I heard supply is 'difficult" to say teh least. With a Hoosier, if I need one in a pinch, or if I need 4 in a pinch, I head over to the App Tire guys and get them. That simple. That's worth a lot to me, and something you (the OP) should consider when making a tire choice.

Andy, will the new Goodyear tire be available in 15" sizes?