Everything was running smoothly with 15.12.
This shows crossfire enabled and but no GPU2 load during game^^
(BEFORE YOU SAY: NO MY GAME IS NOT RUNNING WINDOWED, that was me alt-tabbing from full-screen).
I even tried adding my own profile in Radeon settings with the ffxiv_dx11 executable, setting crossfire mode first to default, then to AFR friendly, then to Civilization: Beyond Earth mode. Nothing worked.
In DX9 mode crossfire mode runs fine.