IEMusic
Headphoneus Supremus
I agree. More treble makes me fatigued too fast when listening to metal. ST7/EJ07 is just right indeed.
But I also have to mention that I'm using a custom cable, improving the treble a lot.
As for the EST drivers, for now it is the most natural treble sound that I've heard. It is not so peaky as BA and not so harsh as planar drivers. I'm really fond of it!
Good point! I usually need tame treble when listening to most metal.