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Have you tried flipping the Ion trap front to rear? You will probably have to rotate it 180 degrees as well but it might help but I think you need a double trap also.
The retrace lines are common on older sets and are usually more prominent when the contrast is low.
I would suggest that you may have some weak tubes in the video i.f. strip, if you have any extras try replacing them one by one and see if it improves.
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