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You seem to be on the right track with it. I'd suggest you look at minimising your spider effect as well. My cheap 114 newt had a massive plastic moulded spider assembly which had 4mm wide 'vanes' and the central hub was larger than the diag by about 15mm. I replaced it all with a much smaller (23mm as originally about 40mm ) assembly and made a big diffence in both diffraction and reduced light obstruction.
Sometimes the simplest solutions yeild the best results.
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