So based on Ghea's info that their measurements showed a progressive damper characteristic (getting stiffer, providing progressively more and more force) at high damper velocities this is essentially what 'pack' is.
When landing from a jump or on larger bumps the damper will be travelling at high velocities so pack in compression is useful. But because an RC damper is simple you'll also get 'pack' in rebound which is not desired as it unsettles the car on bumps or a rough track. I assume this rebound 'pack' is what the Ghea pistons take away.
I will be measuring AE, Ghea and Losi pistons on a full size cutting edge damper characterisation rig soon so will find out.
And to answer some other trial and error experiments that have not been successful to date, you are setting an impossible task unless you have the damper measurement data to know exactly how it's behaving.
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