I'd make your particle's decay faster. The complete circle looks a little wonky to me, because of how long the particles last. I'd either decrease the particle count or increase the rate of decay so that only 270-300 degrees show up at any given time.
Not 100% sure if this will help but what I usually do is just edit the normals, move them all vertically upwards then drop an omni light in with inverse square decay, tweak it then bake it out :)
In the Fields of Endless Carnage, far to the south of Quoidge, a corpulent figure works tirelessly through the night--dismembering, disemboweling, piling up the limbs and viscera of the fallen that the battlefield might be clear by dawn.In this cursed realm, nothing can decay or decompose; no corpse may ever return to the…