Oh to be fair Battlefield 4 is the only game that actually runs like it should. Unfortunately I don't play that any more.
YES I have tried single cards by themselves.
what games are you playing, CFX applies to DX9-11, DX12 uses cards differently
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Not every game can leverage multi-gpu configurations. Most notably you will see Unity games only leveraging a single GPU. So simply because you have anbled Crossfire mode, it doesn't mean every game will run with it. I don't know how often this is updated etc, but check it out for a rough guide on supported titles: Crossfire Game Compatibility List | AMD Crossfire Wikia | Fandom powered by Wikia
I have never had a game trigger and run in Crossfire when I have disabled it. Which game have you seen this happen with, and does it happen consistantly?