ShadowRenderPass Modulative Artifact

Basically these artifacts appear (color dependant from white to black on the alpha level of my ambient lighting)

with my ShadowRenderPass when it is set to Modulative.

Additive removes this artifact, however, causes a whole new mess of problems when working with my shadows and Flare

So is there anyway to remove these artifacts from Modulative in the way that they arent rendered in Additive?

(Red circle is my actual shapes, Blue circles are these shadow artifacts. showVolumes is turned on in this screenshot)

Reference to my post here for how to fix the Additive Shadows + Lensflare problem which was forcing me to use Modulative Shadows (yuck!)