The thread is growing quickly, I haven't parsed all the info yet, but off topic, I'm replying to track down potential bugs. With that said, this statement sticks out to me.
Fangs of Fury is an Attacks Only crystal (melee) trigger. If you're testing both Fangs of Fury vs Primal Rage, then testing with Drulkar Wrath (spell) won't work on Fangs of Fury. Primal Rage will work on Ranged and Spell (Drulkar Wrath) but Fangs of Fury won't work with that test (requires Melee, not spell or ranged attacks).
If the crystals aren't working correctly, we certainly want to fix that. But the parameters on Fangs of Fury looks correct to me. I don't think there is anything you can hover, for a tooltip, to prove that your own attacks has been increased, with the -5% delays.
Crystal - Tootip Comparison