I prefer my lcd2 for blues, jazz and most types of rock and metal over the he-500. The only genre I mostly use the he-500 for is post rock and black metal due to the smoother treble.
T1 is used for classical, ambient, movie watching plus gaming.
Th600 mainly for EDM, Kpop, Industrial rock and hip hop
I want to get a hd800 and/or W3000anv in the future. Trying another grado is a chance. Fischer audios limited edition FA-011 I have heard compared favorably against the hd650, and that is apparently very aggressive.
Did you ever try stretching the headband with your thumbs in the center, pulling them outward. Can make a world of difference for some with the lcd2 clamp. The metal in the headband tends to loosen up the grip after a few times stretching YMMV
HE-500 smoother treble than LCD2?