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I'm not blaming the focuser for the offset. I think it has a contribution too, as perfection only exists in mathematics, not in engineering.
For visual use, without a field corrector or reducer, such an offset would not matter, but when used as an astrograph the optical axis must go through the center of the corrector group.
Anyway, I played a bit more with the collimator and rotator and came to the conclusion that most of the offset is coming from my collimator's telescope.
This little scope was put together from junk optics and the objective doublet must have a bit of wedge error. One day I'll make a good sighting scope for this, if I find a need for it.
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