To be honest, that's most likely it also i need to try other pads for sure. Well recorded stuff sounds excellent on it. I'd love to hear your thoughts on tubes with the vc.I havent experienced some of the issues you mentioned but I use the default Auteur pads. I can say that due to the piss poor production values inherent in a lot of metal recordings, the VC really exposes the shortcomings. This is the double edged sword that comes with an extremely revealing headphone.
I believe the dac is to blame because it has too many filters, the majority of which cause things to be pushed back or recessed.is it an issue with the soundstage being too large and diffuse compared to what you're used to? or could it be you're hearing some of the bad production other headphones are smoothing out and hiding? your amp is more than enough for the VC so i don't see it being a power or synergy issue.
I fiddled around with it, and now it's much more forward and to my liking.
The details are all there, but I can't remove the feeling that the drivers are too far away from my ears with some songs.