I have that problem with my HiFiman’s (Drop Edition XX and HE6se). It is like they are asking for more power and you do get rewarded. 
I think I have pretty much sorted it out. Ive found my listening levels have been way to high. Ive tended to crank my HPs until I feel the music which probably isn’t heathly. I spent the other day training myself to listen at lower levels which is hard as often I just want to turn them up but this fixed my fatigue issue. I guess its a matter of discipline and getting used to lower levels. Thx everyone for your sugestions.
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I just bought a cheap decibel meter from Amazon. Usually my ears self -regulate, but if I think I am overdoing it, I grab my meter/piece of cardboard and check.
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Sounds like you figured it out. But just in case you haven’t I will plug my favorite: LSA HP-2 Ultra.
It’s more liquid warm bliss. Like it more than the lcd-xc. And I can wear it all day.
Good luck!
What you describe about those set of headphones is similar to what I am hearing out of the Apos Caspian. So I would say that the Caspian is another suggestion as well if you are looking for something with solid low-end, with rich sound while still providing a decent amount of detail. I can listen to these all day with no fatiguing issues. Really great headphone. Quickly becoming one of my top favorite headphones that I own.
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Caspian is made by the right company to do that. 
The only reason I didn’t jump on board for that is I own the hp-2. And I can’t imagine it would be anything but a sidegrade for me.
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