Oh yes adding i2p trackers would make things work better, lemme try that out.

For i2pd, by default the http proxy binds to localhost but you can set the ip to 0.0.0.0 in the settings to bind it to all interfaces. Then you can just do :4444

Yes i have tried i2psnark standalone. It works well, but i have noticed it connects to i2cp, while qbittorrent binds to the SAM port. It’s a bit technical but i wonder what’s the difference between the two protocols?