Here is another challenge to be aware of. Let's say you adjusted your body position per advice given. However, what you may not realize, but what you need to pay attention at is that as you increase the lean angle and the road gets closer to your eyes, it gets a bit scarier, and to avoid that uncomforable feeling, you unconciously start moving your upper body back over the tank, while at the same time in order to preserve the speed/radius you would lean the bike more - possibly exceeding the lean angle and scraping hard parts. Later on you might be sratching your head trying to figure out what happened.
What is important here is to realize that dragging a knee is of much less importance than carrying as much of your weight to the insde of the bike. So, when that scary feeling kicks in, resist the urge to move your body back over the tank. It is hard to overcome this feeling and trust that nothing will hapen. Therefore, it is a very gradual process.
Essentially, you need to very gradually and over time lean a tiny bit more while at the same time preserving your upper body position. In extreme case, you should imagine your entire inner side - knee, elbow, shoulder being next to the road, while at the same time pushing the bike away from you.
If you get a chance to watch a footage from Rossi's gyroscopic camera (it stays upright regardless of the bike's lean angle), you will see exactly that.
So, it is very important to not sacrifice the correct upper body position to the urge of dragging the knee no matter what.
And if you do it right, you notice that for the same speed and radius, your rear tire will develop chicken strips. In this case, it would be a good thing.