I pulled two plugs tonight to do a compression test. Both plugs looked extremely clean. Light brown I'd say. I got tired at the end of the night but number 1 and 2 are at 145 psi. I will do the rest this weekend.
I always pull all the plugs when doing a compression test. Maybe I missed it, but did you cap off the distributer vac line while looking for a leak. I hidden leak can be in the distributer diaphragm, same as in a brake booster.