[AC86U] Lower than expected Wifi Speeds with Gigabit Fiber

Hi,
I recently upgraded to Bell 1 gigabit fibre service and getting full 1.14 Gbps to my modem. The modem/router is Home Hub 3000 (Sagemcom). Connecting with Ethernet gives me around 950 Mbps. But with Wifi on 5Ghz it's been limited to around 200-250 Mbps on all my AC devices. My upload speed is around 400-700 Mbps.

So, I bought the AC86U and was hoping it gives me better Wifi Performance. I connected it to the modem using Ethernet and PPPoE session. I get around 900-950 Mbps on the...

[AC86U] Lower than expected Wifi Speeds with Gigabit Fiber