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Geez that's tough. I've never had a tracking error as low as 0.3arcsec rms. But I suppose the +2000mm focal length is the killer here. For me, I see no eggs with 0.5-0.7arcsec rms at 1000mm focal length. So its a bit curious.
If it is tracking, then the eggs suggests that tracking is worse in one axis - probably DEC, its always the culprit. Check the error for each axis and maybe adjust the offender.
Other things?
Check the individual subs, maybe there's just some bad ones with big deflections
I know nothing of SCT correctors so can't comment on that.
I doubt it is tilt as that would end up with uneven distortion over the field.
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