Configuring ORBI RBR50 with ATT Fiber

Hello all,

I've been a long time user of my Orbi RBR50 first with an Xfinity cable connection. It has been rock solid (occasional outages but nothing significantly long in duration). The impressive thing about it is that I often got within 90-95% of the purchased connection speed. So for a 500Mbps connection, I regularly got around 450mbps on multiple wireless devices, such as my IphoneX, IPad Pro (2016), laptops, etc. These test results were obtained via the Ookla speedtest app. Orbi has always been configured in Router mode, while on the Xfinity cable modem it was configured in bridge mode.

I decided to move to ATT Gigabit Fiber due to the faster connection and symmetry in download/upload speeds. I got everything configured and working with just the first try (the instructions here really helped: https://community.netgear.com/t5/Orbi/How-do-I-setup-bridge-mode-in-the-ARRIS-BGW210-700/td-p/1875994). The one thing I noticed about the instructions was that the OP mentioned some things went working in AP mode so he reverted to using a Router mode, which I am also using. Orbi router and satellite are both using firmware 2.5.2.4.

This is where is gets interesting. Here are my speed test results:

1. IphoneX - wirelessly connected to Arris BGW210-700 (before I disabled all radios/WiFi on it): 420-530mbps download, 400-435mbps upload -- with Ookla Speedtest app

2. IphoneX - wirelessly connected to Orbi (in router mode): 350-420mbps download, 250-330mbps upload -- with Ookla Speedtest app

3. IphoneX - wirelessly connected to Orbi (in router mode): 850mbps download, 700mbps upload -- with Netgear Orbi app (huge difference!)

4. IPad Pro (2016) - connected to Orbi (in router mode): 365-420mbps download, 360-420mbps upload -- with Ookla Speedtest app

5. Thinkpad T490s - connected to Orbi via Ethernet: 875mbps download, 915mbps upload -- on Speedtest.net website

6. Thinkpad T490s - connected to Orbi via Ethernet: 845mbps download, 700mbps upload -- on built-in speedtest within Orbi router's configuration page

So based on these speedtest results, I'm wondering which ones to believe -- the Ookla speedtest app (which supposedly is also the speed test provider within the Orbi app) seems to report speeds that are HALF of what the Orbi app reports. On many other internet speed test providers I get a range of 280 to 480mbps, but never anywhere close to the speeds I see via the Orbi app. So I have one source reporting acceptable speeds vs all other sources reporting otherwise.

I've taken most of the defaults when re-setting up the Orbi router (which I factory reset first). However, I did turn back on Implicit Beamforming, MU-MIMO, but left Fast Roaming disabled. Daisy-Chain is enabled, but I only have one satellite and since it made no difference when I used to have an Xfinity connection, I left this one alone. All of the Advanced Wireless Settings in the 2.4 and 5 GHz sections are enabled.

Are there other specific settings that I should check/change so that I can maximize the speeds while connecting to the Orbi system via WiFi?

[One curious thing that happened after setting up the Orbi router today is that all my devices connected to the router but my wireless printer connected to the satellite and its issued IP is still on the 192.168.1.x range, while all other devices are now on the 10.0.0.x range. I guess I should reboot the satellite to see what happens...]

Any guidance will be greatly appreciated!