You might want to reconsider the wing you are running. They found that that style made a boatload of drag on the straights and didn't provide as much downforce as they thought. Steve Mitchell in his 350Z is what I'm speaking of. They moved to a flat double deck style wing, and made major time improvements. Car was running 2:02's at Buttonwillow and moved down to a best of 1:57ish.
Take a look at the wings that the JGTC 350Z's in the lower class are running.