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Mick, I've held off making any suggestions as you stipulated at the outset "good understanding", and I'm basic at best.
The latest image does indeed look slightly off.
Couple of things to ponder. I sometimes use the laser to get the secondary pointed at the primary, but normally use the cheshire and star to finish the primary, not the laser.
In my case (and possibly yours, you image and don't observe as much, correct? If so, using an eyepiece to collimate may result in the result looking good, but when you put the camera, CFW, extension tubes, etc, etc, on maybe this changes?? Another option is to collimate with the webcam in place, although this will be lighter than the imaging unit I suspect.
Good luck,
Gary
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