From what you’re describing here, it sounds as though the ether cx are being driven satisfactorily - or well enough for your needs if the sound is effortless.
I know what you mean: I have a car analogy to describe my LCD2-C. Before I tried the Jot 2 on a loaner tour, these headphones were like driving an old, sluggish diesel car that only came to life if you put your foot down. With high enough revs, or at a certain speed, the car would begin to perform reasonably well. But it still wasn’t great. With the Jot 2, it was like I’d switched out the diesel engine for a good, strong V8. The LCD2-Classics were woken up beautifully and, as you put it, sounded effortless.
Ok, back on topic: are you not happy with your ether cx, then? Or do you just want something better? It sounds like a CanJam visit to NYC next February is what you need - if there isn’t a retailer near you that would let you try a bunch of headphones. There’s also Audio 46 in NYC if you feel up for a weekend trip. I can recommend local places for pizza!