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Thanks Colin.
I believe I found and hopefully rectified the cause(s). The screw at the top of the FTF was quite loose - so I tightened it a bit. I read that TEC recommended tightening this screw for heavier loads as they noticed some flexing with 3.5" FTF and this is supposed to help. Also, a ring holding the field corrector's lens in place was for some reason not tightly threaded in and the lens was moving a bit inside the corrector. I suspect this could have been the main gremlin. So hopefully, the next astro image from Prossy will have beautiful pinpoint stars across the entire image.
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