@wlutke I have absolutely zero brightness in my system with N200 and I used it with 2 different DACs. Your Pass amp and the AZ speakers aren’t bright. The AZ Satori is a warm sounding cable. You have a revealing high resolution system.
So here’s my take on the hot top end that you have experienced now with two streamers…
1. Look into room acoustics - area rug between listener and speakers if you don’t have a carpet, first reflection points (side walls, ceiling if possible), speaker positioning and toe in
2. I would replace the AQ Ruby interconnects with AZ Matrix Ref MkII
3. Power cables, especially the one on your DAC - look into upgrading to a cable that works well with digital. Doesn’t have to be expensive. Again, AZ have El Nino power cord that works well with digital. The AZ Krakatoa should be good on the Pass amp (it’s a smooth sounding cable).
The higher the resolution the more critical things like room acoustics and cabling become. Tube rolling won’t help much if the room acoustics aren’t in order.