The image could be tweaked a little but the whiter clumps your seeing on the SI are the heavy grass areas and the darker spaces between the grass is where it’s mostly soft bottom. The thicker the grass and softer the bottom it’s harder to see heavy details but in my opinion the grass edges and clumps look pretty obvious on SI.
DI you could play with color palette or sensitivity a little bit to get better bottom returns through the grass. Depends on the weeds but sometimes I can see the individual leaves on the image and sometimes it’s just too clumped together.
Have you spent much time graphing yet in the spring before the grass is really thick to get the hang of things?