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If you can see examples where it is fully corrected then that gives you confidence it can be done.
Funnily with my experience in flatteners they have not been this sensitive to a few mm being exact. But that's with refractors and so its a different optical configuration.
If you got 94% it sounds like a few more mm should do it.
I presume you are confident the focus is spot on as I do notice with sensitive spacing correctors the stars can look off and then when you are in focus the stars all come good.
Did you allow to add 1mm for the filters and 1mm for the CCD window to the backfocus to get optical back focus as per the Astrodon site advice?
Greg.
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