Just bought me a new Z7, 29" DL, 70#. I am thinking of shooting GT 5575 arrows. My arrows are 27.5" long with 100 gr tip. Does this combination have too little spine. I see on the Gold tip web site, with 27" arrows it recommends the 5575, the 28" it goes to the 7595. So I know I'm right at the border, and I prefer the lighter weight of the 5575 to gain a few more fps. Will my combination shoot the 5575s well or should I go to the 7595s and give up fps?