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[i]If you are landing froma huge gap jump then you want lots of compression damping[/i]
I agree, Molgrips, but you need high-speed compression damping rather than low-speed compression. My RS Revs have adjustable compression but it's low speed and does nothing to stop the forks shooting through their travel. The Dirt Jumpers though have proper high-speed compression damping and that does do as you say.
Edit: and you can have too much which leads to a compression spike. Changin oil weight is the way to adjust the high-speed compression on Marz forks - another factor thown in for fun. 😉
Yes, 'better' forks have more than one damping circuit. Well I say better - different applications.
Low speed damping though will still act as I described, but it's less flexible. Having one circuit/valve means that it'll always be more of a compromise between suppleness and big hit handling.
I wouldn't be taking advice on typing from someone who puts "BECASUE" in capitals.