landscape material for imported landscape

I have been looking for automated terrain texturing for some days. After finding a good but old tutorial I found how to use height/slope blending as well as a combination of the two. I tried it on a hand-sculpted landscape and it works like magic. But when I use it on a imported landscape(World machine), it doesn’t work ie only the height blend works but not the combination.
Please tell me what is wrong with my imported heightmap?

I really liked the ice veins in landscape mountains. Could anyone tell me how to achieve that?
This is an additional query.

Here are the Screenshots.

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Here’s how the material looks on a hand-sculpted landscape.

Down below is the material when applied on a landscape created from an imported heightmap.

As you can see , only the height blend works or rather the slope blending is somehow overridden by the height blend. Also the height blend is absolutely disoriented. the dark yellow colour which you can see covering most of the landscape is actually meant for areas below sea level.