@Drdiamond In general your settings seem fine. Get rid of these optional settings: Restart XC220-G3V, then your mobile and test again.

@tarekitsme Yes, your topology description does makes sense and this should work as exspected. Talking about the wireless and wired speed - there's only one rule here - nothing can beat the cable in...

@Luca5chv Leave the settings as they are. De nada.

@Yupanqui Follow this link - probably it will give you more perspective.

@BenTee As I posted - you can also experiment with setting a different wireless channel for 5GHz band. How to find a wireless channel with less interference is decribed in this document -...

@Jarro I believe C6 will do the job - it's a gigabit router. As long as the routers are in wireless range the mesh will work. When they are not, routers will behave as if they are in AP mode.