Keep trying different things. When you attack, you can also swerve a bit (not dangerously) to shake people out of your draft. I do this a lot. Also guttering them during your jump helps.

Try spending time up front and see how it works out. See if attacking from 7th works out any differently than attacking from 37th.

Just keep trying different things until you know what your true limiters and strengths are. As it is right now, you're getting consistent results, but not winning. Ask yourself why you're not winning. What can you change to avoid those situations?