I have tried the green slime too and it didn't work on my shocks. I noticed in the manual that it just tells you to pull on the shock shaft to 'seat' all the parts. I noticed people at the local track using a tool to compress the parts inside the shock body. The tool was just a molded piece of plastic that had a shaft that resembled the thickness of the shock shaft with a piece of flat plastic that pushed against the shock internal components.
I purchased a new set of shock shafts and have yet to put them. I am thinking maybe they are scorned somewhere? I don't see any damage, but at this point I will try anything. It is only one shock out of the 4. I have replaced all the internal parts a couple times now. It is becoming frustrating.