Change activation area of each button

For the longest time I have been having major typing issues with SwiftKey. I keep accidentally pressing keys I don't want to. The keys below the key I'm pressing activates instead. I guess my fingers are too big and because the letters are printed on the bottom vs middle, my eyes/fingers naturally want to tap the lower portions of the keys. Is it possible to change the activation area of a key? Like I'd like to add some sort of dead zone at the top of each key to prevent them from firing.