Well, the boss frames are there when you want to keep tabs (be able to focus) on multiple mobs at once. I believe what you're looking for with single boss fights is the focus frame.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
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