@bigfatpaulie that fuzzy center image is most likely due to first reflection points not being treated. The fireplace has some say in it but it’s negligible. The direction of the sound your Sashas put out is forward with tweeter and midrange dispersion to the sides at a slight angle. I don’t have a fireplace but had exactly the same issue. Cured by treating the first reflection points and installing bass traps to tighten up and refocus the lower registers. Snapped together nicely.
May be talk your wife into hanging heavy curtains over that window by the right speaker. Mean time, toeing the speakers in to fire directly at your listening position should help with imaging as well.
As to the DACs, you have a nice list. If you use Tidal and don’t need DSD, go with the Berkeley Alpha 3 ( has MQA processing capabilities). However, keep in mind that it has no USB input and you will be using AES with it most likely, which means the clock in your streamer is what you’re going to be relying on. Not sure how good that section of the Lumin is.
With the DAVE you can use USB (will most likely sound significantly better using that interface with your streamer) but you don’t get MQA. Chord tone is superb though.
With MSB, you get awesome USB implementation, MQA and DSD capabilities.
So if I were you, my choice would be the MSB Discrete.
Just thinking out loud….