I would be honored to assist you in your breeding quest as it sounds very similar to my own, future goals (when I get some land beneath me, I'm looking now) Suggestion, if your roosters are not there yet, perhaps they just need a role model. You could try to raise a few geese with your next batch of chicks, you'll want at least 2-3 males and a few females. When the dominant male gander becomes 2 much for the flock or you. Then kill him and cook him. Ideally you should end up with a much kinder and gentler gander who will still be fierce in terms of him and the remaining geese defending the chicken flock. But be prepared to loose 1-2 or all the geese with every successful major attack. In the 1st attack a coyote killed a gander plus a rooster (no more geese) in it's 2nd attack it killed 22 or 24 laying hens. Hope this helps.