Thanks guys,
Marc and greg you are both spot on i reckon. Firstly yup the consistency is out because of the process in that some areas are sharpened and others not, so that was just processing laziness
I thing you are right about the adapter too Greg, i have a terrible nosepeice that i had made up for my Atik 11002 in order to accomodate a standard 2" focuser, it was designed for 3" and above so this is probably the bending issue for sure creating warping.
Kind Regards
shane