>12 kHz can change a lot depending on how you wear headphones, and YouTube has a lower high-frequency cutoff that could reduce the impact that has on the sound. Try putting the XS on differently, maybe angling it forwards or backwards.

e: Wearing glasses or having long hair could also potentially roll off the low end and exacerbate any shoutiness, so watch for that. Also, make sure you turn off EQ before trying anything so it doesn't influence the sound.