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I think you would need to look at when the bad ones were. If they were all at the end you could consider focusor slip, or temperature movement. Is poor shots being cause by dew build up on lens? Is the camera adapter tight and not moving over time. From my limited experience with a similar setup these are some of the issues I had.
How are you triggering the camera? are you using mirror lock up with a pause to dampen mirror vibration?
Good luck
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