I think there's alot of behavior things that might be more important than the type of food. Not letting them gouge on food or water before or after exercise, resting about an hour after eating, slowing down a gulper, etc. I lost my airedale to bloat and he had nothing on his stomach at all. He was 10 and had been increasingly affected badly by stress. A bad incident while being boarded sent him into a tailspin and he hadn't eaten in approx. 48 hours before he bloated once, the vet was able to resolve it and then he twisted a second time about 24 hours later and we made the painful decision to let him go because we doubted seriously he would survive the surgery. I was told that as these dogs who are prone to the disease age, the abdominal muscles that help support the stomach and hold it in place begin to weaken as their general condition does with age and it can be more likely to happen.
I feed homemade that is moist and contains alot of water, so swelling is less of an issue. I'm still careful, though. I feed them twice a day (all in one meal is not supposed to be good for volume reasons), crate them at mealtime so there's no stressful gulping or anxiety, and keep them quiet or crated for an hour after meals. I don't feed within an hour of exercising, sometimes longer if they've been at the dog park and have really been crazy and active. Gulping water has never been a problem but if I noticed it, I'd limit how much water they had access to at one time.
It's a scary and sad thing. I hate it and live in fear of it. I try to do everything I can to avoid it. I've read such conflicting things on the use of elevated food bowls and my airedale was fed and watered with one, but now I'm feeding both on floor level. Kind of hard to elevate a food bowl in a crate.