I know you didn't like the graphite, but just in case someone out there is
thinking it sounds like a good idea:

Some reasons not to use graphite:

It tends to clump up and fall off. Its a conductor, so if it falls on
electrical connections, it can short them out. This may be more likely on
some planes than others, and probably only if the clumping is happening on
the back side of the yoke bearing. It is flamable, so if it shorts out
power leads, it can start a fire.