I would assume any additional stiffness felt while driving a CS is coming from the stiff sidewalls of the Cup2 tires. Maybe that's why some reviewers are reporting a stiff ride while others (could have PSS mounted) are saying it's more plush.
I quickly swapped out the Cup2's that came on my GT350R for PS4S and the ride got softer and better in almost all aspects (no more tramlining either).
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