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From what you have said the actual focuser may not be square to the optical axis and may need shimming. Never had to do this before but you should be able to check it with a laser collimator reflecting off a piece of white papeer inside the tube. Mark where the spot is when the focuser is centred then rack the focuser out and mark the position of the spot, then rack it in and mark the spot. If it moves either sideways or up and down then the focuser is not square to the tube and will need shimming to fix this problem otherwise you will collimate till the cows come home and never be happy with the result.
Hopefully this is not a problem but it is easily checked.
Cheers
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