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I'm running 18 inch MY02 wheels on my NB and have 285/30's on the back with no problems. I'm running ROW ride height as I'm in the UK.
Just curios, what size are you running on the front? I also have a C4 and just got a set of used MY02 spokes with factory S02As in 225/40 and 285/30 that have quite a bit of life left. My calcs show a .35" (nominal, new tire) diameter difference front to rear, which is ~1.4%, well less than the mentioned 5%. Thoughts?