Problems with Arty and blast radius

[Perturabo]

I changed the blast radius of 155mm arty to 150m and now I have problems with fire support.
It seems that for some weird reason, it's accuracy is dependent on blast radius.
Very small blast radius causes it to become a line with about 10 meters between explosions.
When I set the blast radius to 150m, ~95% of rounds land on edge of circle whose radius is about 120m. As a result, no rounds hit the intended target. Any ideas how can I have normal groupings of rounds and high blast radius?

[Perturabo]

Hey, is this game still supported?

[Andrew Williams]

Sorry, I can't de-bug your mods for you.

[Perturabo]

Shell spread pattern and accuracy magically changing when blast radius of a weapon is changed is a game engine bug not a mod bug.
There's no logical reason for shells to fall on edges of a circle, 120m from target.