Your on-axis stars are still out of focus which makes the edges only worse. Regardless of tilt I still think your collimation is slightly out. In order I'd do:
1_ collimate on a star in the center of the field.
2_ focus accurately on a star on the center of the field (use a bahtinov mask)
3_ check any remaining tilt if any
4_ sort out any field curvature left if any.
Last edited by multiweb; 11-06-2020 at 02:08 PM.
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