What is your main cam? You could try attaching that to the OAG and see if you can pick up stars then (i.e. to confirm whether it is a sensitivity problem). I tried autoguiding for a while with a Celestron NI5 colour cam, and it was frustratingly insensitive even through an 120mm frac! It would have been useless with an OAG. So perhaps this is your problem.
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