I thought the same thing. I never had any luck calling solid so I changed it up. I started with a few howls and waited a few minutes then ran the cotton tail distress for about a solid min on volume 4. Waited about three minutes and then hit the call again for about 45 seconds on volume 5. A minute after I stopped I heard one circling down wind in the thicket. Hit the call for 3 seconds and he came right out to look. Bang!!!
Good luck.