Try *subtracting* the Whatmough_Terrain_Function from the sphere function,
instead of adding it. That *looks* like it works.

Instead of this...
#declare Whatmough_Terrain_Function =
function { S(x, y, z) +  f_ridged_mf(-x, -y, -z, 1, 1.9, 7, 1, 2, 1)/50 }

Try this...
#declare Whatmough_Terrain_Function =
function { S(x, y, z) -  f_ridged_mf(-x, -y, -z, 1, 1.9, 7, 1, 2, 1)/15 }

(I exaggerated the terrain depth, just to see it more clearly.)

On the right-side hemisphere of the planet, I'm seeing a subtle but large
round-ish outline, which doesn't look like part of the actual terrain. I'm
wondering what that is.

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