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It won't make any difference which flattener you use, as the distance from the prism to the QHY9 sensor and the distance from the prism to the QHY5 sensor hasn't changed. This part has to be sorted out first, they both have to be the same distance.
It might be that the prism is located too deep into the light path and the prism stalk has to move up, closer to the QHY5.
You could try a small spacer in front of the QHY9 to make up the difference but as you say the WO flattener distance will then be wrong.
You could try getting it going without the flattener installed and then add a flattener later.
Clutching at straws here.
Cheers
Bill
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