I put a set on my car this spring after listening to my father rave about them. In the past I wouldn't even consider Conti's for any car, but I am shocked at how good these tires are.
They are very sensitive to tire pressures and temps so I have been running them around 28 - 30 psi cold all the way around (35-36psi hot track pressures). For a street tire they are really good at the track as well. Great turn in and lateral grip, if they are weak it is in longitudinal grip (ie braking or accelerating) but that is compared to the MPSC I normally run on the car. More importantly they are fun, predictable, and with a good alignment hold up really well at the track.
I take it that the original poster is only running them on the rear, so that is most likely the cause of the problem, and may also be running too high a pressure in them as well.
Just my thoughts.
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