I had PSSs on my car when I first got it and couldn't stand them. Going from Star Specs on my M3 and RSX-S, it was a step backward in grip and response. I thought the PSS were just not as aggressive as I wanted. I think they are more of a touring tire that can be sporty, than a sporty tire you can drive on the street.
I don't think the size is the problem so much. The extra slop could be dialed away with some PSI. When I autox, I need stiff sidewalls and usually go 43 to 46 psi actually. 38 is way too low to me.
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