Syncthing slow when installed via Docker/Portainer in Open Media Vault; ports are forwarded and Syncthing is connecting via TCP and not by relay, but sync speeds haven't improved. What should I be looking at to fix this?

Ports were forwarded in the router (for my OMV server only; my router doesn’t allow forwarding a port for the whole router) according to Docker Hub :

 - 8384:8384
 - 22000:22000/tcp
 - 22000:22000/udp
 - 21027:21027/udp

The ports are not forwarded for the other sync device (PC running Ubuntu 20.04, installed direct and not in Docker) as for IPv4, my router didn’t let me: it automatically chose different ports.

Within the Syncthing in Portainer, port config looks like this:

 0.0.0.0:21027 21027/udp
:::21027 21027/udp
0.0.0.0:22000 22000/tcp
:::22000 22000/tcp
0.0.0.0:22000 22000/udp
:::22000 22000/udp
0.0.0.0:8384 8384/tcp
:::8384 8384/tcp 

Any ideas what else I could look at to resolve this?

EDIT the Syncthing Portainer states that the network is in bridge mode, using the network created by the stack used to install Syncthing.

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