You need the damping to work in 3 stages the first stage is called
Critical damping where the car is going over small bumps and ruts usually base on the frequency of the wheel tyre combination and air pressure.
Mountain bike shock don't do this as your body is used to do this we this out when using them on formula student cars they work and then over heat cause they couldn't cope with the Critical damping rate.
Your next stage is Yaw as the car turns this is to control the roll rate of the roll centers you, you want to set the rate so that you enable roll transfer but be to stop the car from rolling over if the tranfer is to fast.
The third is high impact landing of ramps where full stroke of the the damper is used.
This can be done by 3rd damper or 3 or 4 way damper that peugeot use to use or by a fluid that behaves similar to silly putty or custard.
I think will find that the silicon oil will exhibit a strange behaviour in the testing if you do a frequency analysis and full stroke impact loading.
This could also be dependant on how the accumulator behaves this either the air gap in assoiated type shocks or the rubber bladder in tamiya type shocks.
You need to read race car vehicle dynamics by miliken and miliken to understand the maths side of it more and the tyre side as well.
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