Guard +1 is more than enough, especially with the new "middle" guard animation that doesn't push you back so far. The main attack I've seen that still pushes back far with Guard +1 is Volganos' shove, and supposedly that *still* pushes back and causes damage with Guard +2.
I hate sigs. I hate witty sigs, funny sigs, stupid sigs, quote sigs, sigs in Japanese. I hate your sig. And I hate mine.