You are going to get some mixed up answers about Angel Wing and Twisted Wing Tips, what they are or aren't and if they are preventable or fixable. Feed your geese lots of greens from the time they are born and not so much the high proteins and corn fats-- sunflowers and eggs are plenty of protein when they need it [like winter and breeding season]. Try not to breed curly to curly so much and you might see what you are hoping to see in your flock in the next generation. BUT be prepared that lots of answers are about to hit and send you in a lot of directions. KISS IMO. Geese are herbivores and the curling gene bred to itself too many times is going to cause issues. If you work with those tenants I think you'll be happy. And maybe try reading about how the EU has less of these issues than the US and draw your own conclusions. Either way, enjoy your beautiful new flock!