I don’t understand this at all. You mean you just converted the mono directly to stereo, which is… pointless? Considering receivers can do it with the push of a button and it doesn’t really do much of anything anyway since you can’t magically make two channels out of one? I can only see this as being worthwhile if you just used the mono as a guide, extracted the unique elements and inserted them into one of the stereo mixes and/or made a mix from scratch. Now that would be an interesting project. Forgive me if that is indeed what you did, but the way you are wording it is a bit confusing.