You really have to work to get on top of the ball if you want it to break. If you dont, you might as well not even bother with it. Someone is gonna take you deep if you dont get on top.
Without actually seeing you throw it , and how it's breaking, i can only offer a bit of advice.
1- Like a said b4, get ON TOP of the ball
2- get your elbow up, bcuz the break you described would make me think that your dropping your elbow.
3-Put in some serious time getting the rotation right. You want that ball to come out of your hand with some serious rotation.-----The way i judge it, when i am throwing, or watching someone else throw it, is by whether or not i can clearly see the seams rotating. When i throw it the way i like it, all I can see after releasing it is red with a tinnnny lil bit of white.
Also, Judging by how hard you have to throw it to get it to do what it should (in my opinion that is) i would say that it is going to be more stressful to your elbow that a standard curve. Make sure your actually old enough to throw something like that, we dont want you getting hurt.