I don't want to sound hostile here, but that belief that "gee, I'll get owned if I try a different server, so I'll just stay on the same one all the time" is what keeps Kalt, Palermo, and Switch from being full and active all the time. Being part of this organization doesn't just involved "pwning", it involves helping out as a whole. Step out of your comfort zone, try a different map.
It takes just a half hour (or less) to learn the basics of a new map anyway, and the benefits of doing so (getting exposed to new parts of the game) far outweigh any early losses you'll get to your score.