I’ve had a lot more luck running it in Docker with gluetun, along with qbittorrent in Docker. That way you can bind the whole qbit container to the VPN, which is basically bulletproof. All config options are available as Docker commands, you just need to use Proton’s website to check the server list and pick your favorite p2p-enabled server.
It does take a little fiddling, but it’s solid once you get it running. Port forwarding works too, once you figure out how to enable it.