Hi Scott,
I know you put a lot of work info this scope and the images are getting better and better. May I ask - what is the focal length of your Newtonian?
EDIT: Okay, I figured it out
About 1200mm, so your scope is about F/4.8. This corrector should work since it has been optimised for F/4.5. I am assuming you measured the distance from the CCD to the bottom surface of the MPCC T2 thread. Really, no idea why the corrector is not helping with the stars...