I've got a '97 220 that I built last winter specifically for really tight, steep, rocky, rooted Northwest singletrack. I installed ProCircuit pipe/silencer, boyesen reeds,weisco piston and RB Designs carb and head mod. The bike will tractor up anything and can rip on top if needed.
You have the right bike for the right job. I would highly recommend the RB Designs carb and head mod. It allows you to lug even better and run a gear higher which is really nice in the woods. Call Ron at RB Designs and he will jet it spot on for your conditions.