Modifying Atmosphere Fog .usf file

Hi.
finally, i did well to bent the landscape. and visually, it looks nice. i just playing the world position offset in the material.
But, when i add the atmospheric fog, it just looks weird. just like image below:

there is a big blank space below the horizon. and i think i could bending the atmosphere fog.
after so many experiment on atmospherecommon.usf and read the documentation of Eric Bruneton, the final went well, but im still not satisfied.
the image below is the result :

i dont know why it glows so much. maybe anyone here has any suggestion if i did something wrong?
anyway, here is the changelog of AtmosphereCommon.usf

/// FIRST
RadiusGround     = 6360 
RadiusAtmosphere = 6430
RadiusLimit      = 6431

Changed to : 
RadiusGround     = 63 
RadiusAtmosphere = 640
RadiusLimit      = 641

/// SECOND
ViewPosition.z = (ViewPosition.z - View.AtmosphericFogGroundOffset) * View.AtmosphericFogAltitudeScale;

Changed to :
float OwnAltScale= 20.0f;
ViewPosition.z = (ViewPosition.z - View.AtmosphericFogGroundOffset) * View.AtmosphericFogAltitudeScale * OwnAltScale;

/// THIRD
float3 ViewVector = WorldPosition - InCameraPosition;

Changed To :
float3 ViewVector = F - InCameraPosition;
where F is Spherical World Material Function << its same function to make my landscape bent

i know its hard and complicated. but i just want to experiment for my educational purpose.