This probably won't be much help but I have these tyres respectively on a Caterham and an Elise. The 888s in warm weather on a very light car (e.g 500-750kg) are heroic and preserve ride quality but tramline quite a bit, albeit less than some other similar tyres.
In this context, however, my concerns would be twofold - 1) They are both very difficult in cool/cold weather 2) I am not sure they are well suited to a heavy car like the Z, in terms of ability to handle the forces involved - but I'm not 100% sure about that in the light of some of the earlier postings.
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