I finally got rid of my ghosting last night.
What is really concerning me is that I did not actually find the reason. I will try explain.
I confirmed it was not my tv at fault by watching content from sky, RPi3 and direct content played via usb by the tv renderer. All fine
I went through every option of the Q10 trying everything. Nothing worked. I even changed Imprex engine settings with no effect.
Last night I disabled Imprex engine again. This time however when I was testing content I was loading via the actual Q10 player and not via kodi. (yes I know kodi just launches the q10 media player). The picture was perfect. I then switched Imprex engine back on to confirm. Was still perfect.
I am completely baffled. The only thing I can think of is there was a setting somewhere that caused the Imprex to screw up and only managed to clear it when I had nothing else but the media player task running alone.