hmm...if you don't get to a point where the car oversteers and requires countersteer, then you arent sliding much.....
You might want to try slicker tires first off. Lots of people would suggest heading for the Sims, as they are the slickest and are supposed to mimic real-life tires. Then, try more abrubt and extreme steering changes to throw off the car's balance and get it sliding. Harder steering should help especially at lower speeds.
But if you are sliding, but just ending up on the outside wall, try slowing down a LOT. Drifting isn't the fastest thing in the world. In fact, it's pretty slow. I usually go through a turn 1 gear below the suggested one (the blinking red number).
Then, there's just practice. Try out poking the gas/brake at the beginning and middle of your drifts just to see what it does. Some around here would suggest the hand brake, and WRC drivers do use it IRL. However, a lot of other people would denounce it as pure evil. Personally, I don't like it as it forces the car into neutral/clutch in, so the revs drop off unless you hold the gas too.
Keep up the practice and have fun. Hope I've helped at least a bit
