what happens is that if you dont have enough air in the top of the shock,the damper will hydrolock because there isnt enough air to compress as the piston rod takes up volume in the shockbody..the air shouldnt be used to slow the damping down,thats what the piston is for.
having too much oil in the shock and not enough air will blow seals on hard landings and cause excessive pack thru hydrolocking of the piston rod not the piston itself.
i always build the shocks so that piston rod only rebounds out around 5mm max,if you go anymore,it can become hard to see wether pack is occuring thru piston hole size or because thees too much oil in the shock.
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