Sure. I watched the Vali thread for a while, so I'm up on the sound signature and microphonics. But, it's nice to hear about how it pairs with specific headphones. I also have the DT880 and I've heard good things about it paired with the Vali as well.
As for the 1350, I've found it a little funny with certain amps. I actually love it with my Audinst HUD-mx1, but really don't like it at all when paired with my Asgard 1. I have no idea what it is, but the Asgard just make the 1350s sound a bit lifeless and bland. I really don't have the technical know-how to understand why that may be occuring.
Go with your ears - I know exactly what you mean by "lifeless and bland" - no technical explanation necessary.