Well if he finds the vocals on those videos sound thin to him then they're thin to him. Two people listen to the same earphone with the same set up can come up with different ideas about that very earphone.me and three people listen the anime of he mention. and i listen lots of trailer and tube videos i have nothing he mention about. if he try on different sources and stil same i think the iem is not the we use
I do too find the mid is a little thin and recessed on these, which is very nature consider the fact that you already have very powerful bass and quite energetic treble. Beside, they have kind of a metallic tone to them, which makes vocals sound less satisfy, but great with electronic and metals, so it's a trade of here.