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That looks terrific especially for only .8 hours.
That looks to me more like a spacing issue with the TCC rather than tilt as all 4 corners seem affected. The TCC is fairly intolerant and needs +/- 1mm correct spacing. There is a note by Roland about how to check the spacing if its under or overcorrecting. Focus in the middle and note the focus position then focus on a corner star and note if you had to rack the focuser in or out.
Greg.
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