I don't have TL account but there is a process that I have followed on some difficult to seed private trackers which gave me reasonable success in building buffer and maintaining good ratio. My upload speed is around 2 Mbps and I have never used a seedbox.
1. Initially, do not download what you want, but download what is latest and greatest, even if you don't need or want it.
2. Just take one torrent at a time and make sure that you select the latest possible torrent (within first few minutes of appearing) with most popular content (e.g. some latest movie or popular TV show).
3. Keeping points 1 and 2 above in mind, download the chosen torrent (latest and greatest), and then continuously seed it as long as you can. There will be good number of leechers in first 72 hours.
4. After 72 hours, repeat step three for the next torrent, but keep your previous torrent seeding.
5. Also, you can download some freeleech torrents (e.g. billboard 100 etc.) which are likely to be popular for long periods and keep seeding them. Leechers will come eventually.
6. Consider cross seeding i.e. download from open trackers and seed back to TL. Any torrent uploaded on TL will likely appear on open trackers in next few minutes. If you can somehow verify that the files in both torrents are identical, you can download the same from open tracker and seed back to TL. Make sure cross-seeding is allowed on TL, and if it is, learn everything about it, plan it carefully, and use it watchfully.
7. Your upload speed matters a lot, so configure your client to reserve maximum upload speed for your TL torrents.
Keep patience as it takes time to build good ratio. Most private trackers are full of seedbox users these days and it is getting more and more difficult to build good ratio.
Good luck