Suggestions for network topology improvements needed

In Ventura County, our backbone is primarily made of Ubiquiti AirOS radios.  They link the AREDN nodes on 10 sites together via DtD (in a dedicated VLAN2).  The AirOS nodes look like a mesh network to the AREDN nodes with a path to each AirOS node, and all of them almost equal LQ/NLQ DtD links.
The issues with how the current implementation of OLSR handles route flapping lead to frequent periods where the mesh network is unusable due to routes failing back and forth between the various (virtual) paths on the backbone.

We've not been able to figure out how to configure AirOS to look like a star network instead of a mesh network for the AREDN nodes.  If someone could point us to any documentation on that we'd be grateful.  (And no, as much as we'd like to convert the backbone from Part 15 to Part 97, it's still carrying some commercial traffic).

As an alternative, we tried setting up a separate VLAN between two of the sites on the Part 15 link and tunneling two AREDN nodes between this.   However, we couldn't make it work, most likely because the node is only listening to VLAN2 for DtD broadcasts on VLAN2 (doh) and not on the different VLAN we set up between the two sites.   Again if anyone currently has any ideas on how to implement this approach, we'd appreciate them!

Here's our current network mess.  Every AREDN node shown thinks it has a link to each of the Part 15 radios:




Thanks in advance

Orv W6BI