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You won't get perfect results till you spend a lot of money, perhaps ~10x the cost of what you're using now. (Note: "perfect" = limited only by the fundamental laws of physics). If you were promised "perfect stars in corners": yes it very much sounds like marketing hype. Re the 1mm mismatch: experimenting with the placement of the optics is worth doing even if only to learn how sensitive the setup is to that.
Bert (avandonk) knows a lot about these scopes and how to make the most of them. If he does not read & respond to this thread then it'd be worth browsing his old posts and maybe firing off a PM to him for further info. Bert's brain is definitely worth picking on this topic. (Sorry to sort of speak on your behalf Bert, but I've seen you do amazing things with Synta/SW ED80s.)
PS. Re your other thread about switching to a Newt: a fast 8" Newtonian would be trickier still to make near perfect off axis.
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