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Hi Peter,
Welcome to Ice in Space, are you confident you have the correct 55mm spacing between the MPCC and the CCD chip?
If so then the next step is to check collimation, coma correctors are a progressive corrector. They do no correction at the centre of the frame and gradually increase correction until max correction at the edge of the frame.
So the CC expects perfect round stars at the centre where no correction is applied, but if collimation is out then the round stars may be off centre. This causes the CC to over correct one half of the frame and under correct the other half of the frame.
So if you have some good collimation tools I would get that right first and you should be OK.
Cheers
Bill
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