That sounds correct. I'd keep them for a while longer to see what it is that you want to change from their sound... Senns are dark, so don't expect a matured Senn can to be up front or aggressive. However, if you find that the latter sound suits your style I would look to Audio Technica's offerings.
Oh gawd yes, I just reviewed the AD900x and WOW is was very aggressive! It was WONDERFUL for metal. and I don't even like metal [must be the lack of agresive headphones ;3] Still do try the AD900x. I think you'd like it. And check out my review of it at my blog and here at head fi