try sticking your decoys out a little further than usual. sometimes ducks wont feel comfortable landing in birds that are unnaturally close to the bank. if you still dont get a response, move your spread around, experiment til you find something they like a little better. remember that puddlers will most naturally sit in a more rounded shape whereas divers will form a long line. ducks, when comfortable, will tend to be more spread out, so make sure there is good distance between decoys. Furthermore, if your like most guys these days, you probably put out at least one mojo decoy. i've hunted them enough to know that they can make or break your hunt. if you are using them and birds arent dropping in like they're supposed to, put them back a little bit in the reeds or grass so they are less obvious, or put them away altogether. sometimes birds just like the old fashioned spread a little better. in regards to your calling, its way to early in the season for birds to be shying away from a properly blown call. it might help to get some good lessons, or if you think thats not the problem, you might just be calling a little too aggressively and neet to tone it down one. all of these factors combined could make a huge difference in closing the gap between you and your birds. keep adjusting til you strike the perfect balance.