I haven't done "end-game" anything in a really long time, but isn't the answer to people posting strats online and ruining the fun for everyone to simply imbue the end game mobs with AI and/or randomness? If you don't know what you are getting or you don't know what the mob will do you can't plan for it. Sure it'll go horribly wrong sometimes (too easy/too hard), but maybe that's the fun in having to stay on your toes rather than every fight being a well choreographed dance.
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