good question. the answer is i don't know, but I would imagine they are are transitioning back in the the stock front. sorry i've actually never seen them in action.
i was basing my opinion on your offsets +10 (with spacer) vs. offsets that are known to fit under stock fenders. essentially what you bought +30 was the right offset, so you have to make up for that whole 20mm spacer. reducing that by 10mm with these fenders would help you get in the ballpark. the rest could come from mild camber.
the other option is to go the CamCam route, except not bagged/hellaflush whatever. This is the money is no issue route.
Full metal wide body bagged 370z
edit: what are you running in the rears?