NO, you will NOT have greater gains in fat loss by doing more Abs. Abs are just like any other muscle, you work them, they get bigger. If you still have a layer of fat, then NO matter how etched they COULD be, they wont. Diet is the ONLY thing, along with Cardio that will make that 6 pack stand out. Cut the Carbs, up the Protein, and do 30-45 mins of Cardio a day, first thing in the morning on an empty stomach.