Need thoughts on how to Best Max SQ when Streaming?

Gear:

Innuos Zen 3 Streamer, Audio Mirror Tubadour DAC, Pass Labs INT 25, Tannoy FSM speakers (94@4ohms), Kimber 8t cables, transparent audio interconnects. Pangea power cables.

Two dedicated 20amp lines. One for digital and video. The other for the rest.

I do employ some cheap-ass 2" x 2" x 3/4" square foam sandwiched  rubber isolation pads under the three pieces I have. You know the ones. 

Awaiting delivery of an Ether Regen device that does something good between the Router and the Streamer. 
30 day trial. $650.

What other devices or trickery will move my Streaming SQ up the scale a bit further? 

I do not hear above 8k and one ear misses some low frequencies.

I only listen from 55db to 70db max. 

The room is mid sized with treatments. 

Speakers are arranged in a highly asymmetrical position as it relates to the room.
I sit about 8' from them and they just slightly further apart.

Understand I am very happy with the musicality of my system as it stands
but like most readers here I am always ready for "Even Better" if it is value
justified. IOW no money to throw away.

Not techno savvy so please use small words to convey anything technical.


For all those immediately tempted to tell me to bag this idea as analogue is the only
way to enjoy real musicality, I will throw up my arms in surrender now so save your energy
for another lucky soul please.

My approach to musical enjoyment is this:
If a person can have access at their fingertips to all the music now available on your preferred
Hi-Rez provider and store it for instant replay, the sacrifice of some of the analogue
SQ is a trade off I can live with.

My hearing at this stage probably will not let me get most that last detail anyway.

That's my approach for now anyway.

Thank you in advance for your useful ideas!!