Do you think your loft location could be part of the problem? Poor visibility from your house and surrounding roof tops?
While it was my understanding that pigeons can find lofts that aren't necessarily visible from above by marking other landmarks like the nearby house, I definitely think my loft location could be part of the problem. It sits in the back corner of my property, and is covered by many trees. It is small.
On the other hand, almost every bird I've realeased for the first time flies around for a while, sometimes over an hour, and returns to the loft and hangs on its roof, so if they do that just once, why shouldn't they be able to do it again?
I do live in a pretty urban neighborhood, houses close together, and from the sky everything looks pretty similar, but my house faces a park, and my roof is quite a bit larger than the surrounding houses, so the park and my roof I thought were pretty darn solid landmarks. My house is also a few blocks from a major freeway junction, which I think should act as yet another large landmark....
I am curious to hear anything you may have to say about loft location though. I know ideally it'd be dead center in the middle of a field, but I do not have that option at all.
I wonder whether I should just call this quits and keep all of my remaining birds in my loft and just let them breed and fly their offspring? Start them off outside the loft young, and go from there? Once they're trained, then let out the adults and they can follow the youngsters?