Totally fair enough. The LCD-4 is a great headphone, but I would definitely recommend buying used at 2000USDish (or less) vs new as the LCD5 seems to be on the horizon at some point. I know that the Audeze Reveal VST/AU might tune the LCD4 more to your liking. Or of course, trying out software EQ vs hardware so there isn't any space taken up on your desk. I don't EQ extensively, but I do use it here and there. It can be (software EQ) and incredibly useful tool for adding a bit bass heft, or maybe taking down a treble peak you really find troublesome. Its free, and non destructive to try out, so I would recommend giving it a go sometime, just for a bit fun if nothing else.
The LCD weight is certainly problematic. Perhaps a LCD4z, but again, might be problematic in terms of fit and sound signature to you. Not sure.
The LCD3 might fit your sound preferences nicely, but again, weight and comfort problems abound.
The only other thing I can think of currently might be a Meze Empyrean if you could get a good used deal. It leans towards the warmer, melodious sound vs brighter neutral detailed modern planar tuning you describe not vibing with (which I completely understand.)