I know what you mean about the repetative part on the tape, but with the fight one it seems to be ok.
I tried decoys and found that they would land in trees out of range as soon as they saw the decoys.
What I found works best for me is to find an area in the woods with a small clearing, everything in range, with short trees and just let the tape play. Short trees are the key, with no decoys I found they would circle around looking for the crow/owl fight just over the trees, with taller trees they are out of range most of the time.
I play the whole tape, I think it's around 1/2 hour, if nothing happens I pack up and move to a new spot, much easier to move without decoys.