Well just to put in my two cents..  These v1 bmminer units have by far more hw errors then ive seen with any of the antminer line.  I'm sure (no I'm positive) its throwing good blocks away.  They told everyone to upgrade a while back and pulled all the code for the old units.  Id say that should be a big red flag.  Them pulling the old code from download.  I also once tried to put it up and was asked in a pm from bitmain to not post that code. Hmm wonder why.  So another knife in back from bitmain.  In their haste to market they put out machines that don't find blocs properly.  I did however which is what has me scratching my head find two blocks on solo with two dif s9.  So I know they do work.  What I know also about the machines is if you put in more than one pool it throws tons of dup shares.  I have no idea how adding a backup pool causes this but that is my exp.

honestly I hope we are wrong.  And the gut feeling I have will come to fruition.  Looking for a block spree soon;)
BR