It has nothing to do with equipment or secret info. All what you mentioned are the very basics, including dodging (mainly A and D keys), rocket jumping and knowing the pace of the game.
First of all you are in the lowest ratings of the game (mine is probably 30 times higher lol). I'm telling you this so you know there's a lot of room to improve, which is why I told you to watch that video (at least 5 minutes) so you get a grasp of all what's possible to do in game.
As I said, what you are experiencing is the barrier between tier3 ffa and tier4. A tier3 player cannot even see tier4 servers until he is tier4 himself, and in those there are better players. Better players dodge, rocket jump, etc.
What happens now is that the game notices you are not suitable for tier4 now (better players, that dodge etc.) so it demotes you to tier3 (against players that do not dodge etc.), then win some matches on tier3 and get promoted to tier4 and the cycle repeats. It's a common problem that only gets solved by improving so you are suitable for tier4 ffa, or rather not lose all the time when playing on tier4 servers.
There are plenty of tutorials out there. Start with the episode 1 of
http://www.twitch.tv/search?query=le...%20quake&stp=1 -- $4.99 a month.....
edit: Here's another short example, this time on ffa.
http://www.youtube.com/watch?v=KNNgy1cc4GM
Note that him, a regular player (not the top), moves faster, times items on his head, dodges, etc. only because of skill, not equipment or some sort of secret knowledge, even less so cheats as someone wrote at the end of the game.
Everything is on google, youtube, twitch, etc.; for example youtube quake3 movement tutorial.
Thing is on tier3 you won't see the servers he plays on (the game blocks it) but when you hit tier4 it will, so you'll face him and probably lose. The funny thing is he (tony) feels the same towards the "mercenaries" as he calls them, that are better players that used to play for money or glory, because he loses to them as badly as you would against him because they are simply better (have more knowledge about the game, think about more aspects, more experience, etc.).