All you peeps having trouble with mouth calls, try using the Chattahoochee "Excited Hen" call. I have no affiliation with them, I met them at a show in Alabama, PA or maybe NC years ago, and became a big fan of their stuff. They just make a really easy to learn call. Ive watched hunters having some issues with mouth calling sound like seasoned veterans in a few days with this call. Its like riding a bike, once you figure it out, you can start to work with any diaphram calls from any manufacturer until you find that one you think sounds the best.
http://www.chattahoocheegamecalls.com/mouth-calls.htm