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Hi Brent
Do you have pics of your current setup with the guidescope?
good to know that you got your guiding going, you will be able to nab those fainter targets with longer exposures.
just a few suggestions.
if this was with the 10inch newt, to me it looks like tilt in the image plane, that is your camera is not quite square to the light path as you mentioned.
When you tighten the barrel screw in your focuser, does it push your camera to one side? this is common with the GSO focusers as the clearance is about 2mm.
take 30sec exposures of orion, and rotate the camera each time. see if the elongated stars follow the rotation.
if it is collimation, stars at the edge would also have comet shape, which I can't see in yours.
second would be focus. are you using a baht mask? if not I'd strongly suggest that. its evident with the softness of m42 along with the stars on the left.
you can make a mask by printing a mask from the online tools, laminating it and then cutting it out with a stanley knife. painful, but cheap and works well.
Also use a laser along with a cheshire. the cheshire's are a lot more accurate than the lasers, especially if the laser isn't collimated.
lastly, how long were your subs and how many subs did you stack?
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