Hi lurk long time no speak, i miss the days of you and twinstack discovering tk12's, im running akg n40 from your rec(home pair ) and MOMENTUM In-Ear 2.0 (beater pair). I was using slow roll off before but sharp roll off might have opened the stage a little for me on the m2.0s, not so much difference on the n40's. I use LDAC so i don't care about dct and Crossfeed but turning off this Hd jitter options is the main difference for me. I may play about with sampling x4 to see what that does.
Lurk Im on my third es100 in 1 n a half years because i keep breaking them, delicate little souls they are lol and i read your post about updating and copied you haha, I've been on 1.3v firmware before and i can say 2.0.2 is a big jump for me.