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You're being too hard on yourself that is a very nice image.
I agree with Marc. Tilt, something is bending slightly with your rig. Are you using screw connectors for your STL or the nosepiece?
Scrap the nosepiece as its gonna vignette (2 inches is way small for a 35mm sized chip) and get yourself a nice screw on adapter at the correct distance from your flattener. For STL and above size you need 3.5 inch or above focusers or perhaps a 3 inch. A 3inch Wynne Corrector would be the go for a Newt and adapters to suit.
Ashley at Precise Parts in Miami is the man. He's not cheap but his adapters are the best.
STL and above chips require large focusers, large openings, large correctors/field flatteners and there is no getting around it. A 2.7 inch focuser is going to cause trouble and you'll waste money trying to solve something that isn't going to solve. Been there, done that. Get everything large and you'll win.
Greg.
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