Sound Quality and Verizon FIOS Fibre Optic Internet

Would something like this help?  https://www.dxengineering.com/parts/dxe-iso-plus-2

AK, what DAC are you using?
What does your system consist of?

Lowrider, the system consists of following;

power conditioner; APC H10
Router, Frontier Arris running Fios
MacBook Air running Tidal
DAC; Synergistic Research The Music Cable DAC (an oldie but goodie) The DAC has special USB cable hardwired and cool linear power supply. Superb sounding DAC. Power from Kinki Studio EX-M7. LoL. I think the name and model number is supposed to imply sex, but it is an excellent sounding very transparent integrated amp.
Speaker cables are synergistic research foundation series 3 metre length. Superb cables that deliver about 90% of the performance of the Galileo series. Trustworthy and knowledgable opinions suggest this cable is the best bang for the buck at present.
Speakers are Evolution Acoustics Micro One. Small, but superb. They throw a huge soundstage and are very transparent. Very dynamic, agile sound, thats well fleshed out. Hard to believe the bass performance for a smaller standmount.

My son has the Devialet Expert Pro 220 driving Magico S3s. The sound of that system is remarkable.

Very nice system.

Switching from the stream run over WiFi then over T-Mobile LTE there is an instant improvement in resolution and absolute clarity

Just so I'm clear on this, iPhone uses Wifi from the Verizon router. Macbook is using T-Mobile 4G LTE. 
Do both use the same DAC?

Tidal streams from both the iPhone and the Mac? Is this correct?
If so, maybe the Mac handles the stream differently.

Can you swap devices?  Will the Mac work on WIFI and can the iPhone use T-Mobile?