Congratulations! Finding and enjoying a fine pairing seems to be a challenge. For some, the journey of finding just the right pairing is the objective and sitting down and enjoying them is secondary. My journey is rapidly slowing now that I have my HD800 and my favorite pair of IEMS. I find that my attention has also moved from the hardware to the music with the search for new and better recordings being my new journey. Fortunately, this journey is proving to be far less expensive.
Same here Buddha.
I use what's in my sig for the HD800(just got the decware yesterday) I think I have found my endgame rig. The only weak link $$ wise is the zdac, but I honestly can't find anything wrong with it without being nitpicky, but I could do that with the amp and headphones too. It's an excellent dac.
To me the HD800 is a perfect headphone, but it does need the right amp. The headphone out of the zdac is pretty lackluster for the HD800, but the CSP3 is a great pairing even with the cheap Valve Art 274B. I can't imagine what this is going to sound like with a Mullard GZ37...