Hi ,
Do you have only BL6000 ? Cos usually they where used like rear speakers or for saround setup or like additional speaker.
They have lack of deep bass on low frequency, but in my opinion they produce really detail sound.
Of course BL8000 is much better speakers!
May I suggest to put additional pair of BL4000 (really good speaker) and see what will happen. BL4000 is much more cheaper than BL8000, and if you dont like it you always can move them to other room.
Hope it helps 
when your Black Label begin to taste like juice just take shot or two of Absinthe and
after that quench with some vodka, if you still feel juice like take beer
with grappa !