As a BLM main, I feel the pain of my fellow BLMs (Neverreap... *shutter*). With that in mind, I'd only like 1 change. Kill the interrupt of Fire IV/Bliz IV if Enochian ends. Just let the spell finish. That alone will be a lifesaver for me and, I'm sure, a lot of other BLM.
As far as the rotation, you only need to refresh Eco 2x before you can recast it again. That's not a big deal to me as that's when I usually recast LL if its up and/or any Thundercloud procs I have. Just don't recast while the previous buff is still up! Bad things will happen.
But the true heart of the matter is, is complaining on a general message board really going to do anything? Is there somewhere else we can provide constructive criticism that the devs will actually see?