Well at least you are stimulating your energy in some fashion. When you say that you imagine a "projection leg" are you visualizing a leg or are you possibly feeling an extension of your etheric body? If you are using visual processes, I'd advise you to wean off of them as soon as you can.

Have you tried to physically target your leg, specifically around the curving of the knees since you are sitting, before you attempt the exercises with your awareness alone. Focusing on one leg at a time, take both of your hands and gently stroke your leg upwards from your ankle to your knee. Release your hands and repeat the upward motion again, from your ankle to your knees. Play close attention to the feelings you get from this physical action. Feel everything that you can, even your hair if you have any (I have hairy legs ) as you refine your mind-body connection by following the physical touch with your awareness. After a few times you can stop the physical action of rubbing with your hands. If you still focus your attention on where you were rubbing you may still have the same feelings "imprinted" on your leg. Concentrate your awareness on these sensations and try to keep them going by feeling for the same sensations you had when you were using your hands. The only difference is that now you are using your body awareness alone. Now repeat the same process, around the curvature of the knee while you are sitting.

Your body awareness will increase with time and practice