Any possibility this may actually be a LEAN misfire? That can show up and smell like running rich sometimes.
Have your misfire tables been nullified?
There's a bunch of other signs of it running rich besides the nose. Fuel trims, obvious black exhaust and the first set of black plugs.
What missfire tables are you referring to? I haven't had any missfire issues however it was loading up on fuel coming off the trail and the fouled plugs were to blame for that.