You want them to be calm in the show cage, and not hit the top of it when the judge puts his hand in to take them out. General handling will help with this alot. It's also good if they are curious when you come to the cage. A good way to get them to settle down and "show" is with treats. I've seen breeders that use raw hamburger, or even soft burger like dog food to train them. With Modern Games I know breeders that put apples just at the top of the reach of their birds to get them to stretch, and then use the judging stick to get them used to the stick and the apple (stretch) together. I am not a fan of the judging stick with Cochins. Some breeds yes, Cochins (IMO) no. I want them to be a little sassy in the show cage, but not brutally mean (males). You want the males to strut a little, and you want the females to be a bit put out about being handled so that when you put them back in the cage, they fluff their feathers and strut a little bit, as if to say, I can't believe I was just touched by human hands, but with also not being afraid of those hands. Put them in show cages for short periods of time at first, get them used to being taken out and put back in the show cages. It's all about them being comfortable with being in the show coop. If the first time they've ever seen a show coop is at their first show, they will normally be quite nervous and won't show well, won't settle down, won't relax, and will keep their feathers contracted and will have an overall scared look to them in the cage.
As far as station goes for a Cochin you want the center of their eye to line up with the top of their cushion. If you have that, you'll have pretty good balance, assuming they aren't shallow chested or long legged.
Some birds never settle down, and temperament is hereditary. I won't keep a crazy Cochin for breeding.