Jagged Shadow Terminators With VSM

I’ve tired that a few times now actually but it doesn’t do anything on my end. I’ve wondered if I’m inputting the command wrong but every permutation makes no difference.
r.Shadow.Virtual.ResolutionLodBiasDirectional -3
r.Shadow.Virtual.ResolutionLodBiasDirectional = -3
r.Shadow.Virtual.ResolutionLodBiasDirectional = “-3”

Are all things I’ve tried for example

If it helps, I also get shadow issues like this