Haven't read this whole thread but just though I'd chime in with this ditty.
Back when I had a pretty good Denon cassette recording machine... you know, when dinosaurs roamed the land... I used to record cassettes to play in my car's cassette player and for other folks who wanted to play tunes in their car's cassette players. My machine had Dolby B & C and something, as I recall, that was called HX Pro? Can't remember for sure. Anyway, I quickly learned that recording (usually from vinyl but sometimes I used mics and recoding live stuff, too) in Dolby was better than not but playing back without Dolby was much better than playback in Dolby. Compress once; not twice.