tball, Definitely exchange them. Even with breaking period that shoe wont get any softer. 2K10 is the same midsole-outsole from the Vapor 6. And that is a horrible shoe.
Its obvious that you are like me (looking for a good confy-support shoe).
So far my best experience is with Asics Gel Resolution. Not just comfortable,but its the only shoe that never got hot and burn my feet inside during summer.
I personally will try once the Fila Alfa 2 cause I know fila does good shoes in general. But if things don't go well, Asics Gel Resolution will be my come back shoe.
So....highly recommend it.