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Could it be parallax error? 2 scopes slightly different views with different focal lengths and different curvature of the optics. When you overlay an image from the TEC180 does it match the TEC140 image or are there different geometries? Some alignment routines will rotate and scale for example and without that using multiple telescope images won't align properly.
With my RHA I notice at F3.8 it shows up tilt tip errors very clearly as elongated stars in one corner or side etc. For a long time I thought I had tracking errors but it was tilt/tip errors and when I developed a procedure to correct them I got lovely round stars to the corners. So I understand if you look at something from the wrong view you don't get a resolution of the problem.
Greg.
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