They may simply not be tuned for that kinda music, as they are already very bass heavy music. Personally, I find them well rounded and manage to keep the highs under control without restraining them too much(a friend likes classical and opera, and we used the female vocals of a song to test it's limits).
Unfortunately, I haven't had the money to blow on anything worth more then $200. Personally, my favoretes are still: HE-4XX, DT 990 Pros, and K550 MKIII. Don't get me wrong, take the pads from the 4XX and slap them on the HE-350, and you have so many issues solved, it's not even funny.