I'm only familiar with Graysons mallards. I only use my own patterns, but have a friend who hunts over Graysons decoys.
His design, with the "cone" back to remove weight from the sides is pure genius. The decoy has a normal side profile and a good overhead shape. The "cone" is only visible from the butt view, and any duck who gets this view of your decoy should be seeing it upside down, as it is belly up!
Good luck, it a great working decoy pattern.