How many servers do you have on this setup? How do you handle persistent storage with docker swarm?
CSI support for Swarm is in beta as well and already merged in the Hetzner CSI driver (https://github.com/hetznercloud/csi-driver/tree/main/deploy/...). There are some rough edges atm with Docker + CSI so I would stick with docker-volume-hetzner for now for prod usage.
Disclaimer: I contributed to both repos.