To report back. I removed/re-added a Hue Lamp, that probably was used as router by many devices. And then all my question marks disappeared. Directly for the Routers and within 10-20 minutes for the EndDevices. I have seen how the mesh has been changing a bit over time. Among the 13 Routers and 10 EndDevices, 5 of the Routers are connected directly to Homey. None of the EndDevices are connected directly. One device that have had connection issues since I switched to v5, now seems to work fine (so far…). Seems to work really well!