Air Forks??

Jul 8, 2006
2014 CRF450 Honda. Just picked it up Wedesday. Trying to get it dialed in for the woods.(harescrambles) its terrible in the front end. It appears to me the rebound is way to slow. I just can't get it to come back like a spring fork. The more rocks and roots you hit the more it just packs up.
What can be done now if anything to get it working better? Anybody got any experince with air forks? Is it possible to have it revalved to where the rebound will act more like a spring suspension?
Wanting to race it tomorrow but something has to change.