Slow Home Internet

With the secondary at -95 dBm it appears to have your RF in the "Mid Cell" for the signal. The primary is a bit of a weak signal but at least the secondary n71 is good. You might still try rotating the orientation of the router to influence the signal wash over the 5G antennas. I found the antenna orientation is an alternating pattern of the WIFI and 5G antennas. From the back side the 5G-1 is at 5 o'clock, 5G-2 is at 2 o'clock etc and the WIFI-1 is right at the back along with the LAN ports etc and WIFI-2 is at 3 o'clock along with the GPS and BT. WIFI-4 is at the front with 5G-2 at 2 o'clock. I discovered I could rotate the router to point the 5G-4 antenna at 7 o'clock toward the tower and improve the signal by several dBm. It is worth a little experimentation. See if you can get the coordinates of the towers where your signals originate. It will help you improve the placement possibly. Hopefully T-Mobile support has shared the actual location of the towers with you as it really does help to know. I am 5.3 miles line of sight of the tower that sends the 5G signal and I obtain speeds up to 153 Mb down and ~50 Mb up at times. It is more common to see 120 Mb down and 25-30 up but that is still not bad. Until I started really tinkering with placement I did not get the signals optimized. It also really helps if T-Mobile is not working on the tower equipment. For me that did account for some of the disruptions. You sound like you are aware of the signal values but here is a handy table I found that you might find useful to have about.