Slow upload speeds with Orbi RBR50

Thank you for your suggestions.

The firmware level is 2.3.1.48.

The modem is an Arris CM8200.

The distance between the router and satellite is just under 30 ft.

I've tried with two laptops. Both have been about 10 ft from the router (40 ft from the satellite).

I'm using Auto and 36. I've also tried channels 6 and 48 but this made no difference.

My laptops both use the 5 GHz channel.

I've used Acrylic to take a look at the channels being broadcast and I don't see any issues with neighbors etc. My channels dominate.

WPA2-PSK is configured.

As I said, the download speeds using speedtest.net on the laptops match with that reported by the router under the QoS settings so I would think that the wireless connections are fine.

I might try the advanced settings you suggested when I get a chance.

I would like to understand the upload speed discrepancy. This would help determine if there's a solution.