Hi,

I have a main router/modem from my internet provider with fiber connected to it.

This connects to the LAN port of a tp link router on the first floor which itself connects to the LAN port of another tp link router on the second floor. Both of them are setup as access points and have DHCP disabled.

All routers have wifi enabled and same ssid and wifi seems to work well though it's not exactly switching to the correct channel when needed.

Wired connections to computers on the main router and 1st access point are great and give about 800mb/s

Wired connections to the second floor router are limited to about 80/90mb/s instead of the expected 800~

Only difference I can see is that the 1st floor access point has dynamic IP enabled whilst the second one has a static ip (had to select this to disable DHCP).

The 1st access point is an archer c6 and the second one is a TL-WR841N.

I really need fast wired connections from the second access point so if anyone can help that'd be fantastic.

Then any tip is welcome for configuring WiFi channels in a better way so that they don't interfere with each other and enable devices to switch seamlessly.