"In short, the more variety in the music I play the more I get confused. Things just popping in and out of the soundstage like I've never heard before."
Go to 1 of your speakers and swap the speaker cables position on the binding posts. Put the cable that was on the + post on the -, and put the - on the + post. Just do it on 1 speaker, not both, and then do some listening. If this fixes your problem, you shouldn't have any trouble hearing it rather quickly.