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I dont know if it will help but I use ( usually) baffled dew tubes some 18 inches to 24 inches long on my scopes to reduce light that as humans we dont notice entering the OTA...now if you think I am crazy take a look at the Hubble Space Telescope and take note how far the baffles extend past the secondary unit...I am sure when I was imaging in Sydney with a street light across the road that there was a noticeable improvement although I never did any before and after tests to have a meaningful comparison...in any event the long dew tube I am sure improves contrast...I like to add baffles as they must work better than just black paint...anyways look at a tech drawing showing the layout of Hubble ..I figure if they do it they may think similar to me on the matter.
If your problem remains past my suggestion I can not offer any other input.
Alex
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