Much faster upload than download on 5GHz

[Beta]

Hi!

I have a AiMesh set up with an AX88U as the main router (in the basement so clients rarely connect to it) and two AC68Us as nodes, one on each floor in the house. The strange thing is that on wifi I get much higher upload speeds than download. I get the same on both nodes as well as the main router. I've also tried a AC88U with the same results. Speeds on Ethernet are great, about 945/945 on my 1000/1000 connection.

Wifi settings are: Channel 100, Bandwith 80 Mhz. I've tried disabling Airtime Fairness, Universal Beamforming, tried auto channel, different manual channels (100 with BW 80 Mhz is where I get the best results). Tried setting Wireless Mode to N/AC/AX Mixed. Nothing has helped so far. I have no other wifis in my area. I've tried on two different phones, OnePlus 6T and Galaxy S8.

Please take a look at the attached picture. Download NEVER exceeds ~250 Mbps.

Any idea what it could be?

 

[Hawk]

I have RT-AX88U as well, while I can't help you troubleshoot, but can assure you are not alone. I have same situation here as well. My download is roughly 60% of my upload speed.