I would personally advise if your using your c6 routers as access points to change all their ssid and wifi passwords to the same details as your main router. Depending on your device it should automatically change by itself to the stronger signal as you move around your property. I had similar setup 1x ax72 as my main and then 2 c6 routers in Ap mode. One at the top of my house on the second floor and the other down the bottom of my garden in my man cave. When ever i moved around my property my phone (s22ultra) would automatically switch to the stronger signal from the closest unit. If your device is still trying to hold onto a weaker signal you can turn your wifi off then back on and then it should automatically pick up the stronger signal and then the process will start again when you move back through your property. Hope this helps 👍🏻