Mixer (Tilling Textures) adjusting Height/Displacement for better blending.

Hello all,

I've just started out with  Mixer and doing some testing with some tilling textures i have made.

I would like to have my sand texture blend more into my metal panneling this is done in ue4

using vertex painting (not mixer). I have tested with a cobbelstone texture I downloaded and it works perfect.

So I know the problem lies in my height texture why it won't blend nicely. How do i adjust

this in mixer and were in the layer stack do I need to fix this? Or do I need to adjust more things to get blend better?

Do you fix this in Displacement layer? and how? as you  can see in my Unreal screenshot the sand doesn't blend nicely into my metal panneling.

Hope to hear from you all.

Thanks in advanced. Decorix