If you ever have a chance to pick up a 226 brush, I highly recommend it. It's like, the pencil brush and a blending brush mixed together, it's awesome! Packs on colour and blends it in all at once.
I actually have eyelids like yours, and had the same problem for quite a while. Try closing your eyes and feeling your eyelid, you should be able to feel where your eyeball is under the skin. This is approximately where your crease should be. If you have hooded eyelids (also like I do), you may need to play around with moving it just a touch higher or lower, or else it could look funny when you're eyes are open. Another good trick for making the crease on eyelids like ours is to make the lower edge of the crease colour hard, and then blend it upwards. So where the lid and crease colours meet, the line is defined, but where the higlight and crease colours meet, it's very blended and diffuse. Check out Nireyna on YouTube, she very commonly uses a technique similar to what I just described. She uses an eyeliner to do it, but I can get the same look with the 226, and much faster.