First off, nice mess and welcome to the board. Second, if I'm catching fish off cover and get hung, I try not to disturb the cover as much as possible until the bite slows. Even if it means picking up a second pole and fish with it while leaving the first one hung. I've even had crappie take my jig off of a stump before.
Yes, the boat shadow will turn the bite off as fast as trolling motor prop wash.