Have you looked into brands beyond Ultrasone? Ultrasone sort of fits a niche since their headphones are very bright, even the supposedly dark hfi-2200 which I owned was quite bright in the upper range and somewhat fatiguing. I've been told they are somewhat intended for acoustic music and this is where they seriously shine. However, you might not like them for metal or hip-hop since those genres typically have more treble energy.
Actually, metal is one of the genres where Ultrasones, especially the Pro 900, shine. Bass emphasized genres favor Ultrasones as well, and let's not forget that EQing does wonders.
About Ultrasones being bright, that's a generalization that shouldn't be done, considering models like HFI-780 and HFI-2400 aren't exactly bright. However, the Pro 900 is curiously bright, yet with a very emphasized bass.