That's really strange. I would never describe the 2C using the word "metallic" even with the original pads, though there are some treble issues. Those issues are completely fixed with the Dekoni pads that were mentioned earlier, though.
In fact, having spent more time with the 2C/dekoni, I must say these headphones have turned into a totally awesome all-rounder with the pad switch. I ended up deciding against getting a Hifiman Ananda to complement the 2C and sold my T1. That's how awesome I've found the 2C/dekoni, and somehow it seems to just get better as the weeks go by. Additionally, they sure do respond nicely to EQ and good amping. I wasn't expecting there to be such unleashed potential - they really do seem to like power. There is lovely synergy with the 2C and Vincent's hybrid tube. I feel there might be even more hidden potential that could be unleashed with proper EQ. I should probably try and learn more about EQ-use in general, and see what I find.
I can't wait until I can afford to order the THX AAA 887 & TA-20. It should be really interesting to see how they work with the 2C/dekoni. I already heard the TA-20 with a 2C earlier for a bit and it was simply awesome. It'll be interesting to see how the 2C responds to a super clean amp like the 887. Man it's an awesome hobby, but so damn expensive for a student.