Eartips make the most difference to begin with. As for me, the large eartip with the widest bore possible and the long, heavy shaft did the trick. In regards to EQ, you never know unless you try. I'm telling you about my personal experience. Who knows if it helps. But you never know until you try it.The thing is I'm not sure if my problem is in 13-15к range, because I feel tension mostly on vocals and guitars. And I should mention that I mean metalcore vocals and guitars. As a comparison, I have Audiosense AQ0 as my main earphones, and I like everything about them, as a basshead. But its a dynamic driver, that can't give me the details that Timeless can give. For now I use KBEAR 08 eartips with stock cable, my DAC is E1DA 9038SG3 that is set to Corrected Min Phase Fast digital filter. There's also PCM to DSD option set in Neutron player. So... I did almost everything with the treble harshness, and as I hear it doesn't bother me anymore, but what do bother is extreme vocals and distorted guitars.
EDIT: Some eartips might also emphasize the 2-3K area which can get shouty on vocals and electric guitars. You might want to experiment with this area too.
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