Surprised Transmission has issues seeding that many, thought Transmission 4.x made improvements in that area. How much RAM does your system have? Maybe at some point you just need more system resources to handle the load.
PS - For what it’s worth you can still stick with Transmission and/or other torrent clients & just spread the torrents among multiple torrent client instances. e.g. run multiple Transmission instances with each seeding 1000 or whatever amount of torrents works for you.
Those are duck tape solutions. Why use them when there is a good solution
Those are duck tape solutions. Why use them when there is a good solution