To close the loop on this. I opened a support ticket and the the feedback I received was helpful. Basically, while mesh allows you to extend a network, it still has dependencies on wired connections for best performance. The architecture of the mesh is actually to have as many wired access points as possible, with unwired 'outposts' to reach those hard to reach areas. I was architecting almost opposite, with one wired anchor point, and many unwired access points in the effort to extend and reach a lot of hard to reach areas. What I learned is, every unwired AP has to depend on a wired connection as a source. So if I only had one wired connection and seven unwired, each was taking up a slice of bandwidth of the source connection. I disconnected a few of the unwired APs and almost immediately achieved a level of stability in the network. So, my next steps will be to do some wiring. I'll be able to tap into my second floor in the house via a coax line and a MoCa adapter, and I already have a spare conduit out to my garage which I'll pull some Cat5 through and set a switch out there to connect two GR60s into. This will give me 4 wired APs. From there I'll see where I might still need some unwired APs to supplement the coverage for my cameras and IoT controllers in other outbuildings.
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