Hi, Sorry for your troubles.
I have not much experience at all (only dreaming of such a set up), but as a sanity check you should try (unless you already did) calibrate your guide error and elongation etc in arc-seconds.
Also, try to work out in what 'axis' the elongation is (sorry you mention the 'axis' in your post, would that be 'vertical'?).
cheers,
Bram
Last edited by torsion; 26-08-2013 at 11:47 AM.
Reason: commented wrt the axis of elongation
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