AP Pro AX Mesh

I have a mesh network setup with 7 AP Pro AXs. They all seem to want to connect to the main wired hub AP rather than creating a mesh. This seems fine but some of the APs are holding around -70 to -80 dBm.

Am I doing something wrong? Should I lower the minimum client strength on the hub AP to force the mesh connected APs to connect to a stronger connected AP?