A bullmastiff won't be able to keep up and let alone the heat! You told me to look at "Dozer bit Rottweiler" i don't know what that is, if you think they are scary, i don't think a Cane corso would be great for you. A rottweiler will get the job done, and has a very intimidating presence, and honestly i'd consider them to be easier to handle than Corso's, depending on the dog you have.Corso, they are known to be more protective, and harder to handle. Especially the Presa Canario, that can have dog aggression against a dog of the same sex, and if one of your males or females are dominant towards the Presa expect a fight out of both dogs. They are by far a hard dog, after owning a boxer and a bermese you will have a tough time with a Presa. They make rottweilers look like first time dogs, from what i was told by a breeder who was and has been breeding for 20 years. I would look into a purebred anatolian, but a great pyr can do just the job, a anatolian should be much faster, and powerful with more stamina.
The Presa Canario will be much more dominant and will require much more than the average Schnauzer. They aren't really pack animals either, a male Presa will probably pick a fight with another male within the household, depending on how you keep your dog's in check, if you let them grow up, both being dominant in one household, expect a fight.
Just from what i've been told after researching the Presa for a year.