Which DACs are known to be sweet/rich/relaxed?

are you nuts or something? you want to get rid of the mola mola dac? that's one of the best sounding dacs on the market, get rid of those crappy cables those are ofc junk get OCC single crystal wire it's far superior to anything ofc at any price and also your focals can be a little bit edgy with that beryllium tweeter as well.

Same issue, but different solution. You need to clean up the jitter which in your set up means an ethernet switch. Think SOtM sNH-10G or similar. Maybe adding optical modules from Small Green Computer (systemOptique) etc.  Again, given the budget, you should have these devices anyway, so start here first. If they do nothing, sell them. 

If I wasn’t clear, the Ethernet switch goes between the wireless access point and the DAC. 

I have two stellar dacs that fit your sonic requirements - Holo Audio Springs DAC (modified by ASi Teknology) and the Audio GD R7 DAC. The latter is stock and both check all the boxes - very natural sounding, great imaging, detail without harshness, beautiful tone colors. Just lovely sonics.

Add a grounding cable to your system and everything snaps into beautiful focus.

I second Audioguy85. I use Border Payrol DAC & really enjoy it on a good system. You can return it if you don’t like it. Sometimes you don’t have to spend big $ to get what you want.  Great small company owned & operated by Gary Dews.he’s very knowledgeable & provides excellent service!