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Interesting, the first four shots indicate to me that there is a little bit of field curvature, this is also evident on your original link to the photo, when expanded there is radial elongation on 3 corners, are you using a Takahashi 35 Flattener and do you have the correct Metal Back Distances.
The last shot shows what appears to be mis-collimation although you say the camera is attached by the 2" nosepiece, I am wondering whether or not you have a bit of slop in the focuser tube, attached is a PDF of how to adjust for that.
I would still be interested in seeing your results using an actual star test, that to me will prove once and for all if the collimation is out.
As I said in an earlier post, this is very simple to fix and does NOT involve taking apart the lens cell.
Cheers
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