Your still pushing the air to fast. Softer brother...slow down and draw the quack out. Feel the reed vibrating. Drop the adams apple and use deep hot air (like your trying to talk like Barry White). If you were to be using a word like hut...don't think your doing the quarterback hut hut hut thing. It's more of a hhhhhhhuuuuuuuuttttttttttt almost like fogging a window air.
Do not get discouraged!!!!! Remember a duck call is a wind operated musical instrument. One doesn't learn to play a sax in a day.