Yeah, without graphs you're pretty much peeing in the wind. I've got some some good brush piles on that lake but you'd never find them without a graph. Down Imaging works just fine if you know you're close to the brush. Side imaging, in my opinion, is more of a search tool. SI benefits me searching for brush other than what I've put out.. If you're willing to do the work to set your own brush, then DI is all you'd need. I would look into Garmin. I run DI on my trolling motor and the images are cancun clear. I don't know how close Lowrance will get you to you're coordinates but hummingbird and garmin get you to 10'.
You think I like to duck hunt? I love to crappie fish!