I currently have Perrin F & R 25mm, with the front set to the stiffest setting and it works really well for me. Then again I used the phrase - it works for me. I think suspension as a whole takes a lot a tweeking and personalization, but there are definitely some absolutes. If I drop the front down to the weaker setting, the back end of the car gets nice and slippery, but still in control...its sooo hard to explain - its like oh there goes the back end a little, but then that's it!