is the Z on the rear wonky? or is it the camera angle?
Edit - just seen the second batch of pics and it looks ok from the left angle.
Personally, I'd wait for a good aftermarket Z badge to come out - even though you've done a very good job of painting the burger black, at the end of the process it's still a nissan burger.
So, I say put a Z in the middle of the rear and debadge the '370Z' completely. I'm sure the Z that you currently have on the rear would fit inside the car nicely somewhere. For example, on my 350z I have taken the back off a 350z silver pin and stuck it on the front of the gear shift surround - looks really good. - I'll get a pic posted.