this is what I didnt as well. go out hard to start. by the third lap they are screaming at you. on my car at least, that center tread line on the ku36 moved around like a wet rag after 2 laps. hot pressures from 34-38. the sidewall on the ku36 is much softer than RSR. i find you can run the RSR at lower pressures 32-36 and get heaps of laps out of em. I also found the ku36 got better after and better with use, to the point where they just screamed and pushed.
Me thinks baron has some shares in dunlop??? heahea
I have seen quite a few of the mx5 guys running the Z1's. I didn't really see them as a tire for heavier cars. what are the sidewalls like in comparison to the ad08 (have you felt them while off the wheels?).
those and the hankook are soooo cheap it is almost worth trying, it is just that the RSR hard to pass up.