Hi John,
You don't mention the software you're using for plate solving. With the combination of the small sensor & long focal length most plate solving software will fail with their default star database. Your FoV is only about 11x5 arc minutes, you need a star database that can work with it.
Adding an OAG won't help with plate solving at all, that's not what it's for. It will be an even smaller FoV, picking off just a tiny section of the FoV of the telescope.
Cheers,
Mark
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