Marc, I don't think that will help, in mine the reflectivity of the ir filter was the problem, and it was really noticeable in difference to the astronomik filter. Swapping them plus moving it further away fixed it.
In your case you are getting reflections from the mpcc it would just pass straight through the ir filter ( 99% ) of it anyway. Fortunately in mine the pflat 68 has a much longer spacing and it doesn't do anything negative to the image
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