Another CBR750 and Comcast/Xfiniity ISP Service Issue

I have 2 RBS satellites. The CBR is on the ground level, one satellite is upstairs and the other is down in the basement. Home is around 3400 sq ft over 3 levels.

Just curious, how does the WiFi channel impact the WAN performance? It is currently set to auto, but I have previously set this to a manual setting trying to minimize the interference. It didn't resolve the instability on the WAN side. Naturally there are multiple WiFi networks around, but my power levels stand out substantially above neighbors. Armor is currently enabled based on the replacement of the router but it will expire in a day - I don't have an issue manually disabling it as I don't intend paying for it going forward. There's no separate ISP Modem since the CBR750 is a modem/router combo device.

I will perform the factory reset and other suggested configs over this weekend as I can't afford the downtime while working from home.