are NET Switches worth considering?

OP - seems like the best choice is to try a used PhoenixNet for yourself then sell if dissatisfied. 

@fire_water 

Of course the PhoenixNet is an excellent option.  I have not heard it but I have seen good reviews and Innuos is I believe a solid company with excellent products.

if you use one of the 2 options I mentioned in my previous post, there’s no need to replace your switch with a nearly $5000 piece of equipment, which seems excessive to me.  The first option would literally cost you less than $100.

I doubt that changes upstream of your streamer will affect SQ.

Your streamer appears to be async USB output only, a good thing, so your DAC is doing all of the buffering and clocking.

The data being processed by your streamer is correct, the TCP connection from your switch has error correction.  The streamer then converts the (probably) compressed FLAC to the true PCM data which is then sent, serially, to the DAC, on request.

The  Bravo SA9227 USB receiver in the DAC converts the serial bit stream to the actual PCM data which is buffered and sent to the DAC chips (8 in parallel!) for conversion, based on the clock in the DAC with zero dependence on timing issues of the input stream.

The only issue then is noise, and looking at reviews your DAC gets good marks for very low noise - I think I saw 119dB down.

I want to thank everyone for their input.  It's amazes me how much experience and knowledge so many of you have in HiFi and in electronics in general. I guess having  a lack of experience makes me credulous, therefore I depend on forums like this. I've made notes and will continue to research this. 

There will always be a deal and an opportunity to buy something, but looking back I should focus on the fundamentals like room treatment before adding more electronics. I actually spent several hours looking at panels and quadratic diffusers and consulting with experts on this matter and I have a plan that I'll be implementing shortly.  But it's so easy to get seduced and sidetracked by all this great stuff in this remarkable hobby!