I'm now at peace with my investment decision and I have now progressed/regressed to the stage of pretending that ZYB doesn't actually exist anymore... so I won't be averaging down.
Ive put my ambitious sell order in on Commsec @ only a 66% capital loss of my investment (a man can dream...) so the continuous red of ZYB no longer shows up on my main portfolio screen and bum me out every day...