Just in case anyone has a similar issue, I solved this by modifying the r.TranslucentLightingVolume properties to increase the inner and outer distances. It lowers the res of the shadows on translucent materials, but they are broken up by the water anyway. r.TranslucentLightingVolumeDim with higher values fixes this, but has a performance cost. A bit of a trade off, but it’s better than the terribleness you see in the photo haha.