The 7's gave me fits with their low cushioning. The 8's have much better cushioning and are just as supportive. I can definitely move as well in the 8's as the 7's. The annoying thing for me about the 8's is that my big toenails hate them, as they are both going to fall off in the coming months. Such was not the case with the 7's, but it was with the 6's.
I have come to the conclusion that I simply don't know what I don't know.