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Just to back up what Rob has said, it is worth getting the set back distance correct before trying to adjust the tilt. The concentric stars around the edge of the field indicate that there is too much spacing and therefore the set back distance needs to be reduced. See attached diagram. Reviewing your attached aberration diagram, it does indicate that the stars in the top right have a very slightly reduced concentric nature to them so you may find some residual tilt there once the set back distance is correct.
A quick test that can be done to confirm this is to move the focuser inwards by very small amounts whilst taking test images. You should see the concentric stars move towards round stars whilst the stars in the centre go out of focus.
CS,
Rodney
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