No question dove are very drawn to decoys. I agree that probably the best way is to use stationary ones as high up as you can get them, because like you say they love to loaf on a high wire before entering a field.
I just wonder what a dove thinks when it sees a mojo way up there in the air, like it's landing into thin air. Hey, if it works then great.
I also agree I don't like them swooping down too low to land near a mojo. I always position mine up well beyond where I'm set up so it draws them in range but they are still moving at mach1 speed. I get satisfaction taking them high and fast.
