i have my wifi channels on 1 and 6 and zigbee on 20. never missed a beatr with zha,deconz or zigbbee2mqtt
The issue with the cc2531 is range, its crap honestly. i had issues all over the place with the first one i had as a coordinator… try and look for a more powerfull one, conbee II, zig zig ah, or Slaesh’s CC2652RB stick. the last 2 are recommended for zigbee2mqtt
otherwise you will be at breaking point all the time
ITEAD just released a $7 ZigBee 3.0 coordinator that is supposed to be much more powerful so I just snagged one of those off of their website and am going to see how it goes (https://www.itead.cc/zigbee-3-0-usb-dongle.html). My CC2531 is doing pretty okay in the mean time though. Also someone posted on Reddit you can use SNACCESSORIES in cart for 70 cents off. Hoping this solves most of my ZigBee headaches.