a great post that was published a few years ago on Matt Traudt’s blog with some tips for people using Tor and the Tor Browser.
it also addresses common misconceptions like disabling JS and using fingerprinting tests, which unfortunately I see floating around every other day on the internet.
I only know of BiglyBT that works with I2P, never tried rTorrent with I2P trackers. I just use the in-browser torrent client whenI need to once in a few months. Sorry if I cannot help here, you might need to hunt some documentation or wiki for I2P port binding.