I went to a seminar a few years back about GVD or "bloat" and it was very eye opening.
They based their research off of 10 years of case histories from around the country, as to not have a bias in their results...or at least stay as far away to one as possible.
Their results showed no specific findings, except for the most at risk breeds...as I am sure you know with owning a mal is all the deep chested breeds.
There is no genetic component to it, but there is a predisposition among some breeds.
There is no specific findings as far as relationships to food in any way, including quantity at one meal, kind of food, when fed (before or after excersize), raised vs non raised feeders, water intake, etc. Even dogs that didn't have a meal, just a treat, have bloated. Even raw fed dogs can bloat.
The only way to prevent it is to get a gastropexy done, which is a procedure where the stomach is tacked to the body wall to prevent it from twisting and bloating. There were some cases of dogs still getting bloat after this procedure, but it was most likely due to a failed attachment.
We got a pexy done on our two Danes just last month during their spay surgery...luckily I work at a wonderful vet that didn't charge me an arm and a leg. The surgery can be quite pricey for different techniques. You can call around but my guess is that you will be quoted something like $500-$2000 depending on where and what technique is used.
IMHO I think that dogs that are fed a kibble diet are more likely to bloat. This is because the dry food bloats in the stomach when mixed with stomach juices...even high quality, grain free kibbles. Even with that said, and my dogs on a raw diet...I thought it was better to be safe than sorry when it comes to this, especially since I have Danes (one of the most at risk). Tons of Danes that I have personally known have bloated (a very small few being raw fed) and some have died. Its said that 1 in 4 Danes will bloat and about 10% of the time they will die from it. The odds are just too high in my opinion to take a chance.
I also don't believe that a raised feeder will help much...but just make it more comfortable for a tall dog like a mal to eat.
This is just my 0.02 on this subject. You can be just so careful, but in the end it might not do any good.