In my opinion, unless a SH5 developer or somebody with code skills can fix the SH5 code for the shadows, tweaking just the SH5 shadows settings is nearly useless
[Shadows]
NumCascades=3
LowResolution=1024
HighResolution=1536
[Interior]
FarPlane=1.0
ExtrudeCamera=5.0
DepthBias=0.0005
DepthSlopeBias=1.0
Split0=0.07
Split1=0.27
Split2=1.0
FilterSizeSplit0=1
FilterSizeSplit1=1
FilterSizeSplit2=1
[Bridge]
FarPlane=15.0
ExtrudeCamera=12.0
DepthBias=0.002
DepthSlopeBias=2.0
Split0=0.07
Split1=0.3
Split2=1.0
FilterSizeSplit0=2
FilterSizeSplit1=1
FilterSizeSplit2=1
[Exterior]
FarPlane=160.0
ExtrudeCamera=50.0
DepthBias=0.0015
DepthSlopeBias=1.0
Split0=0.1
Split1=0.33
Split2=1.0
FilterSizeSplit0=2
FilterSizeSplit1=1
FilterSizeSplit2=1