getting a dog to be obedient under distractions, especially heavy distractions like in the woods or at a school, have to be trained. Its like starting over in your training. They listen when nothing is around and then you slowly introduce distractions and build them up till they can handle all the sights, smells and sounds, and they still know that you have the best stuff. I took my dog to a strip mall last night to do Ob in the parking lot and in front of the stores, lots of distractions there, but i've built up to them.
at 11 months, and how old is dusty?, you can't expect much in Ob under distraction. and ABSOLUTELY do NOT give comands to them under these heavy distractions when they're off leash. You have no way of gaining control of them, and all it teaches them is that they don't have to listen to you.
If you want to let dusty off leash for exercise, make sure its in a safe area, and let him sniff and ignore you all he wants, do not expect him to obey you, it won't happen. So there's no need to set him up for failure and you'll know a little better what to expect.