i hear the skunk2 pro s are stiff indeed esp that u cant change the dampers on them as well...read these thread that i found on search that may help you out a lil more
Skunk2 Pro-C Coilover Review
Review of Skunk2 Pro-S on my R18
Review: Skunk2 Pro-S + New Rev. SPC Camber kit.
Skunk2 pro-s thread