A lot of times what you do in between the hurdles is a result of how you go over the hurdles. If your floating over the hurdles it will be hard to increase your turn over because you have lost your momentum. Not using your arms well could be hurting you if you are spreading them out and then landing awkwardly. You are right about the rotation and aggressive lean, but don’t get too technical in your mind. Stay tall and keep your hips up, don’t let them dip right before you go into the next hurdle. Think attack and running through the hurdle rather than aggressive forward lean. If you can get some video on here it would help determine the ways that people on the forum can help you with your technique and turn over.
I’m glad you’re going for the second opinion… CT scan sounded sketchy.