Mine is growing like a weed too, but I had to take it indoors. It now has flowers, like it did this summer, and the blossoms do smell awesome! Keep doing whatever it is you are doing!
I have a kaffir lime too, and those leaves... Out of this world!
LOL I actually just bought a lemon at the grocery store for cooking and on a lark just stuck a seed in a jiffy pellet. Ten days later had a seedling. I'm shocked how big it got in such a short time. Even if it never produces a lemon its a great looking plant.