Turns out it seems to be a keybind issue - but with a twist. I have two Prot warriors, 1 horde and 1 alliance. I created the alliance one first and have played it fine with GSE and WA. I wanted a horde version so created one, boosted it, imported the exact same talents and named that talent exactly the same name as what I called that talent set on my first warrior, i.e., “Elfyau’s TWW v0.4 Prot Warrior”, and then did a keybind between that talent set and the prot warrior sequence that was already loaded. Nothing would fire. I then deleted out the talent set, re-imported again but with a modified name, redid the keybind with the newly named talent set to the same prot warrior sequence, and voila! Works now on both toons.