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I noticed on your image I submitted to Astrometry that star shapes corresponds to upper case (on attached picture).. so distance is too large (you will have to decrease it somehow to get closer to ideal value.. not sure how to do ity with your focuser without serious modification.. maybe I am wrong).
So, taking into account your FL is 2500 mm, your effective f/number is closer to 6... but still not 6.3.. (submit to Astrometry one frame taken without FR to get exact frame size) which is irrelevant because it is image quality in corners that matters (IMO), and your combination is way better than mine as it is now.
Anyway.. time is on our side :-)
CS,
Bojan
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