Help with blending textures without losing irregularity overlay

Hello, I’m new to game development, and I’m experimenting with my first game in UE4. I’ve been trying to blend textures for my landscape so I can have moss in the valley and basalt with snow on the mountains. When I try to blend them, all the textures lose the irregular stains/ shadows you see in these screenshots, and the tiling becomes obvious.

Can someone show me how to preserve the stains/shadow layers on a blended landscape material? I can’t find an answer anywhere.

I’m using the technique from this video:
And my textures end up like his.

Thank you!