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Sounds like you need a variable length adapter and then you fine tune it by trial and error.
I think there are some like this stock from some suppliers but Ashley may be able to make a variable one that suits your setup. If it has a range of say 20mm you should be able to nail it.
If its getting better as you go shorter then I suppose you need to go even shorter.
Of course you are assuming the corrector works perfectly at a certain distance. We aren't talking Takahashi, AP or APM quality here so there is a chance the corrector is not up to the job. Full frame is pretty demanding on the optics in my experience. But if changing the distance is getting an improvement then the variable approach is the way to go (2 adapters one that slides into the other and can be locked down).
Looking at your corners at an educated guess that looks like more than 3mm error in the spacing. More like 5-10mm.
What percentage did it change when you reduced the spacing by 3mm?
Greg.
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