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Lumen noisy shadows. Expected due to virtual shadow maps?

Hi Guys, quick question here. I tried playing around lumen and realize the shadows in some areas seems a bit noisy. Is this expected limitation due to virtual shadow maps. I have increased the r.Shadow.Virtual.SMRT.SamplesPerRayLocal and r.Shadow.Virtual.SMRT.RayCountLocal and r.Shadow.Virtual.SMRT.RayCountDirectional by setting them to 8 but it doesnt seem to improve the shadow noise.

Is this something expected and are there any ways to work around this?