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I went through the same thought process with my Flourostar 91 a while back. I ended up going with the flattener rather than the reducer to maintain the focal length. However, while there's a lot out there about changes that happen with the reducer, there isn't a lot at all about using the flattener. I had endless issues establishing backfocus, and ended up sending an e-mail to William Optics for the answers. They were quite helpful. But I digress.
My point is that sometimes it's not just fitting the reducer or flattener. Do the research and make sure that you can integrate it easily into your imaging train. I wouldn't wish the little niggles I had on anyone.
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