[DaveO430]

The 6 psi is on the center stand with the weight off the forks so it goes way up with the compression of the forks. It just adds to the springs for higher weight. If you started at 20 PSI it would be a lot more when you hit a bump, maybe enough to blow the seals. More likely is scratches or pits in the fork tubes causing seepage or I have seen seals installed upside down.

 

[DaveO430]

The seals almost have to be installed upside down or some serious damage to the tubes for that to happen.