Wasabi ... have you tried using the 455/800kHz setting on the DI ?? The 200kHz setting is really more for the 2d sonar, and might be the reason you're getting all the trash signals, even with the clutter setting on high.
I keep my Elite 5DSI set on 800kHz for the greater image clarity, while realizing that my DI sonar spread is about 75% as wide as the depth I'm in. I don't use the 455kHz setting, because it's angle of spread is 150% as wide as the depth ... so it's liable to be reading something well outside the spread of the reach of my rods.
... cp