Add a jerk cord to get movement into your blocks.

Buy the butt decoys, I know money is tight but they are 4.99 or something, and the most you would need is 3 or 4.

Keep them clean and take well care of them.

Match whatever you scout. If your seeing large variety of birds, set out a varied spread, mostly small flocks of puddlers, stick with the small groups of Mallards.