So you hit menu, scrolled down to adjust, then turned the sensitivity down? I find that it normally needs to be cranked rather high, but most of my fishing is done deeper water, in some conditions it needs to be much lower. I leave the surface clutter filter off and don't pay attention to the first foot or so, but with the sensitivity down the surface should clear up a bit.
I hated my Elite 4 the first few times I used it, but after a while I figured out how get it dialed in and it works pretty good now.