the cart or the horse?

unfortunalely your system has fundamentally poor matching synergy.  

an AVR as a preamp is not a good solution for quality 2 channel sound. 

i heard your amplifier and it has a most uninvolving sound.

your speakers are very high efficiency intended to be used mainly with low powered SET tube amps and instrumental music.   

no wonder your sound is a mess.  

what is your max budget?  

I would like to keep it under $2500

what I really need to a game plan.....what part of the chain to replace first, second, and so on

i would suggest a used hegel 95 (integrated amp with built in dac, feed it with the node digital output) for great jump in sound quality

or a lesser improvement, though still much improved, would be a nuprime ida-8

no affiliation, not a seller, just advice to help you....

I would get rid of the cart and horse and look into active nearfield monitors for an office setup. 

Personally I would start with the preamp and get one that has a good DAC in it to bypass the DAC in the streamer.

You could try a different streamer for cheap too  these guys seem to think the ifi zen is better  I have not heard either  

i don’t agree that efficient speakers need low power. Look at what JBL does in the pro market. They put large efficient horns with silly amounts of power. Low power amps don’t sound better they just have less power. Unless you love tubes and need to keep the cost down there is no reason for low power.