I agree genetics is key.
My body for example, been down to 8% body fat for the past 12 months and can only show a "5 pack" due to the fact that there's a lack of hypertrophy on my lower abdominal muscles. "The Six Pack" doesn't happen for me until I'm down to 5% BF.
Here's my suggestion, if you're going for strict strictly for aesthetics the key is to gain muscles muscle. I would do this by deadlifting and squatting massive amounts, once you activate those muscles and start building muscle (check out all the muscles you're using by incorporating these movements: erector spinae, gluteus maximus/hamstrings, quadriceps, Adductor magnus, Forearms, almost every muscle associated with hips, trapezius muscle or rear deltoid muscle, Transverse Abdominus, Gluteus medius/minimus (Abductors), Adductors, Soleus, Gastrocnemius)Gastrocnemius), your body will start burning fat at a higher rate and you're are going to be overall more lean.
But I agree with the previous poster, gain more muscle. Most things in life are paradoxes and counter intuitive e.g., for me the key to losing more fat was gaining weight (through power lifting), and doing less cardio. Especially on a calorie constrictive diet (cardio burning more muscle than fat on a low carb diet, no sugar stores body only had muscle and fat to burn for energy).
