I am a , currently weight 140lbs. height is 170cm. I have abt 10.5% body fat which considered "lean" but I just cannot get rid of love handle and mid-section fat.
goal is to increase muscle and to lose body fat and ultimately reveal the "6 pack" abs -which I think it's is not an uncommon goal

I am on a diet for 2 and half months but it's somehow not too effective in terms of reaching goal, the diet is as follows:
Meal 1: Protein shake on trim milk and All Bran Flake (45g)
Meal 2: Half can of Tuna in water (100g) and Banana
Meal 3: Sandwiches - 2 slices of mixed grain bread with fat free turkey, ham and roasted beef with assorted salad vegies.
Meal 4: Same as meal 3
Meal 5: Protein shake on skim milk
WORKOUT
Meal 6: Lean chicken breast or beef and a small potato
Ive talked to the gym instructor and he said Im not taking in enough calories and carbs, Im not 100% sure, and I don't want to put on unncessary fats.
Anyway, I thought of adding the followings to the existing diet:
Meal 1: Extra 25gram All Bran Flake
Meal 2: Change to full can of Tuna in water (200g) plus extra slice of Mixed grain bread
Meal 3: Add 1/4 avocado
Meal 4: Add 1/4 avocado
Meal 5: Add an orange and a handful of roasted almonds
Meal 6: Add an extra serve of vegetables
That will increase the total intake to abt 2200KCal per day. Is it ok or am I overeating or undereating? Any other suggestions?
Just to give you a fuller picture, I workout 6 times a week, weight on Monday, Wednesday and Friday - alternating between upper and lower body (the Body-for-Life method). Then do HIIT 3 times on Tue, Thur and Sat for 20 to 30 mins on each session.
All comments regarding training and diet program will be appreciated.