I recently upgraded my wifi network from an Asus mesh.

I am having been having issues with lag spikes on my wifi connection since I have switched to 3 x TP-Link NX60's. 

Using Tracert, these are sometimes up to 4400ms but it varies enormously.

I have a guest network enabled called "Stables" and my main house network is called "Darkness" 

I am assuming that the hidden network is the wifi backhaul between the routers. 

The "Asus_C8_2G 2" network is running on another router, I have tried switching off this network but it makes no difference.

I can connect using the home network and the lag spikes go away. 

I ran the Wifi interference check from the app "Deco Lab" and received the following report. 

It appears that the networks created by the X60 are all running on the same channels and are interfering with each other.

Not sure of there is anything else that could be causing this.  

As I am unable to change the networks that the X60 routers use, to try and resolve the interference I moved the "Asus_C8_2G 2" network to 2.4ghz channel 7 & the 5ghz to channel 48 and then ran the optimize. This resulted in the X60 networks being moved to channels  35 & 2, there are however still loads of network spikes on the connection and I can only assume that this is as a result of the Stables, Darkness & Hidden SSID networks sharing the same frequencies. 

Does anyone have any suggestions as to how to get rid of these lag spikes & wifi interference as the management app seems to be rather limited in what I can do?