Depending which fq graph I reference the Meze 99 Neo have a 9 or 10 db rise between 4 and 6kHz. Quite the spike that would make many, including me, concerned they'd be grainy and harsh.AKG 701/702.
I agree.
Too much treble makes the sound very grainy for me. I can't stand them!
And open backed.
Focal Elegia. I had a pair. Quite enjoyed them to start with, but fairly rapidly grew irritated by them.
I didn't get on with Meze 99 NEO. I was expecting warm and full, what I heard was lightweight and hollow.
How about Monolith 1060c? Closed Back planars, I believe. Not heard them myself, but they have a good rep.
My favourite closed back atm are Oppo PM-3. No longer made but eBay usually has some used. Definitely worth a try imo.
Perhaps the lightweight and hollow sound was that spike combined with the recessed 400hz to 2kHz region.
Personally I prefer a recess between 500hz and around 3 to 4kHz, but then much less boost around 6kHz.
https://reference-audio-analyzer.pro/en/report/hp/meze-99-neo.php#gsc.tab=0
https://crinacle.com/graphs/headphones/meze-99-neo/
Curiously one of these sites suggests the 99 Classics are much more gentle between 4 and 6kHz and the other suggests they have a similar response to the Neo's which increases further up to 10kHz.
https://reference-audio-analyzer.pro/en/report/hp/meze-99-classic.php#gsc.tab=0
https://crinacle.com/graphs/headphones/meze-99-classics/
Try the Marshall Monitors some time, I have had mine for over six years and still love them. They come with an insertable filter that tames the treble, not that it's a problem per say. They work best on mobile devices and non-dedicated headphone amps.