Landscape Material; Help filling peaks of rocky area with correct texture

Hello, and thank you for taking the time to read this. I’ve made a fairly simple 2 layer blend for a landscape material. It works well, except the peaks of the rocky areas are filled in with grass. If I increase the angle, it fills everything with rocky material. I’ve attached a picture to illustrate this issue, as well as a shot of the material BP. The height map is set up in the same style. How can I overcome this roadblock? As I’m sure painting over the tips manually is far too brute force of a method to be sustainable in future. Thanks in advance for any help!

Imgur: The magic of the Internet

Imgur: The magic of the Internet