Improving speed; couple of questions.

[ZoMbIe828]

128k connection here, torrenting all night every night, just trying to get the best speeds possible for really big torrents.

I usually add every tracker I can find by Google searching the name of the torrent I've just opened, sometimes I end up with a very very long list of trackers for the one torrent. One day I found my download speed moving quite slowly so I removed every tracker from the torrent that didn't have a "Tracker Status: working". The speed increased quite noticeably.

Larger torrents always download slower than the smaller ones, this is because they more often have a worse seed to peer ratio, isn't it?

Is it faster to add every tracker you can find that hosts the torrent (some with really bad seed to peer ratios), or is it faster to use just one tracker from the list of trackers for that torrent that has a superior seed to peer ratio than all the others?

With larger torrents, setting "maximum number of connected peers per torrent" to 60 rather than 30 noticeably improves speed for me. I think the opposite is true for smaller torrents that have better seed to peer ratios, why exactly is this? Why is it never mentioned by anyone in their online speed guides that larger torrents require higher connected peers per torrent?

Can a torrent be faster with less trackers? Do broken trackers really slow a torrent down or is it just my imagination?

Your answers are appreciated, please educate me on anything I'm completely wrong about.

edit: Through my own experimenting I've found that it is in fact faster to use ONE tracker with the best seed to peer ratio out of all the other trackers for that torrent. Of course like any tests it could just be coincidence.