Good post. My late wife used to think I was a bird whisperer. When we were out in the woods by ourselves I showed her how to get a male Scarlet Tanager to go where I wanted. It tried to lead me away where its mate was watching over their nest. BTW, these birds were way out of their habitat. Then I demonstrated a sound to get the male to get closer and closer. It didn't matter how she sounded. I'm pretty sure the male kept getting closer & closer making a fuss to get us to leave.
In the right situation, I can get Mocking Birds to follow me. I can almost always get them to vary their song.
Where your system breaks down for me is when I am in an area for only a day or two and want to capture things like Black Bears & Bald Eagles that I have no ready access to. I have done some research on Black Bears just since being involved in this forum. I found out that at least one of what I thought was a sure enough Black Bear Charge toward me is really a false charge for which they are known. The locals were unaware because they all headed to their cars with keys in their hands. But, in this situation, I got someone to tell when & where to go to see them, but there were quite a few locals as well. It's then that I would love to know that I am shooting with camera & lens that is halfway sharp.
Next, I will try tuning my lenses with my D7000 where I've had the most trouble lately.