I have been unable to locate a solution. 

More info though.  If I do a completely clean install with 1 GPU connected.  Then boot with all 6.  Disable crossfire.  I can enable HBCC on 5/6 cards before reboot.  Reboot once and it is 4/6 cards forever.  Given we have to reboot to install the soft power tables I don't even consider this a half a solution. 

I am sure the problem is addressable by AMD. 

For now mine monero with four and mine something else with the other two.