Teddee5

Always place your decoys either facing the wind or some facing some quartering.
Geese always take off into the wind, just like planes. You cannot place an obstacle in their path where they need to take off, they need room to lift. They will almost always stay away from any form of cover, as to keep predators away from them. They usually stick to the high point of any field for visibility and I must admit, you may be pissing into the wind with a setup like you describe. You didn't say how large the field is, but corn stubble is a great attractor. Good luck and don't give up. It's a great hobby.
Of course, the above is not etched in stone, they will always make a liar out of you, me and everyone else.