I doubt falcons are going to be a problem unless you live near a tall building or a cliff AND there are falcons around (they are very rare). They sit high and wait.. They specialize in flying birds. In a city, they will tend to rely on pigeon. I can't see them going to ground after a chicken in a small back yard. Birds of prey are always looking for how to leave, and falcons are not the most agile birds of prey. A Coopers hawk is more likely to be the hawk that will do the most damage and they will go to ground. They can be quite brazen. Just remember, hawks are everywhere. If there is food, they will come. If the resident predator leaves or is killed, another will fill the spot. You can make your yard unfriendly to hawks. Provide cover for the birds in the open areas and don't give the hawk a good approach for landing or leaving the area. They are not helicopters--they need some room to get airborne. How much will depend on the species and the bird's condition.
Your most worrisome predator will be dogs. I would worry a lot more about your puppy than any hawk.
Why would you think bantams would be spooky? Each breed has a "typical" temperament with a lot more individual variation within the breed than there is between the breeds. Silkies are famous for their docile temperament and friendly nature. I had a few of the nastiest, bitiest, most horrible young Silkie cockerels you can imagine.
Chicken don't tend to play, although I have to say my Polish are quite playful. Play for chickens is scratching and hunting for goodies--nothing will make them happier than foraging for food. My Polish do like to climb trees, but in general they don't go over the 4-foot fence and if they do (twice), they are frantic trying to get back in. If you wanted to give them great toys, give them a great big compost heap full of bugs.
Most of my Silkie eggs are around 35 to 37 grams, some bigger, some smaller. Large eggs are 57 grams. I tell the people who get my little eggs that three of my Silkie eggs equal two large eggs.