I didnt read all the replys but your first post is very off! You need to take in at least 25-30% of your daily cals at breakfast. When you wake up your glycogen levels are at their lowest and need to be restocked. Tuna is better for dieting. I would go with more steak and ground beef for mass. Eat lots of fast digesting carbs like white breads, white rice, potatoes. Eat whole eggs not just the whites. 270 g of protein is too much for your bodyweight. Eat alot more carbs and less protein. Try to get about 500g carbs, 200 g protein and about 100g of fat from good sources.
Dont forget to train for mass. Do compound lifts. Take in your fats at night because they slow your digestive system.
Good luck. Get HUGE!!