Softer distant ray shadow

hi all,

i am using distant ray shadow and like the look of it but cannot get them to be cast softer on a large scale scene.
trying it with buildings/cityscape and no matter what i do, they stay pretty sharp.

is there any chance of getting a more overcast look?
“light source angle” is capped at 5.0 value.

also when camera moves further away there is some flickering on the areas where the shadows dissipates more