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Much as what Gary said... I've found the distance between reducer and chip to be quite critical. Varying the distance will affect the amount of reduction but will also affect edge distortions, field flatness and vinyetting. I would expect the focuser to be before the reducer, not between reducer and camera.
For my Meade (LX200 classic) I have the reducer positioned inside the focuser such that its position in the optical train is similar to as if there was no secondary focuser at all. Doing this seems to be common for LX200's. To do this required having a 2" tube machined to transfer the optical elements of the reducer in to, and that sliding in to the 2" focuser drawtube.
Roger.
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