I've actually stopped using this mod mainly because of weird rendering. When submerged I've noticed that often times the shadows from the sunny side of the tower/boat is displayed on the shaded side.
There also does not appear to be any filtering to blend the sharper shadows up close into the long-distance stock hazy ones, most noticeable with the boat's shadow on the bottom. As such, there is a sharp line at certain distances between the sharper shadows and hazy ones.
I will admit, though, that this mod does clean up the shadows nicely in most other instances.