re: What do you attribute the migration change to?

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I don't really agree with this. You're telling me all these birds (a lot o jeveniles) say, aww shite man lets not fly to Venice because last year we got shot at? No way dude. Sure they may avoid areas once they are here and starting to rest, but I highly doubt what you're talking about changes their migration patterns.

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That's exactly what I'm saying. Migration is a product of evolution and Darwinism is very real. Young birds have evolved over time to follow certain flyways and migration patterns, and the non-inherent element of that migration involves following older birds. So eventually, the heavier pressure received by the older birds trickles down to young birds.

As Cowboy said, I think the point was clarified and made on the second page. I don't believe it's a major contributing factor to the change in migration at all, but it certainly has an impact, and the scale of that impact is directly related to the scale of pressure. Again, I've seen all of this firsthand. As you stated yourself, you don't hunt a heavily pressured area, so I understand the skepticism.

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Right, but the OP is about migration. Jumping from one side of a parish to another isn't a migration issue.

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Again, and this is entirely hypothetical, but depending on the scale of the pressure it could certainly become a migration issue. One side of a particular parish to the other, then out of that parish entirely, then out of the region entirely.

Obviously this contemplates a very large scale of pressure, and I don't think that will ever happen. That said, if you change a bird's migration destination by 1 mile or 50 miles, it's a change nonetheless.