I always heard that most canards have the foreplane as high as possible in order to reduce the turbulence on the main wing. On the X-29, in addition to the cg location, the forward swept wing would be yaw-unstable. Generally swept BACK wings are yaw stable and act like lots of dihedral. On some planes, like the Harrier, they have anhedral on the wings in order to keep it manueverable.
At least that's what I thought.
Allan