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PA has drifted a bit over 2 yrs, hasnt been touched since installation and has settled down over a year, that could cause a problem. Im pretty sure the squareness of the cam is the problem. I have protrack on but not PEC, on installation testing that gave the best result. I havent done a Tpoint model for over a year because plate solve just stopped working (a long time ago) despite every setting being perfect. I got it working once, did the map, and that was it.
I find plate solving can be touchy. It works easily on the Proline 16803 with 2x2 binning but often does not work well on the Trius due to lack of stars. That is also 6.3mp. You have to make sure the image scale is accurate and best to know the north position angle as well. CCDInspector or CCDcalculator will tell you the image scale.
PA is very likely to be off after 2 years. So the tilt and some PA should tighten things up nicely. Paul's right there is some tracking error showing in the best parts of the right side but in the left corners the fainter stars (these show up the tilt errors the most) are horizontal streaks. It must be off by quite a bit, not a small amount to be like that. That's my recent experience at F3.8 (which exaggerates this type of thing). F8 is somewhat forgiving so the error must be large.
Greg.
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