I think I have cracked it!
Why the ghea pistons work so well
When the piston is driven in fast its hydrostatic pressure ( pack )deflects it sideways ( especialy on our angle driven shocks )where friction plays a small part but less on the taper
But when returning the hydrostatic pressure on the taper centralises the piston aiding it's return smoothly
But to get a large difference lots of pack with a quick return you need a valve.
Is that right?
Thanks to everyone who has commented
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