I shall tell you the secret! The milk needs to be steamed properly, which is the most important, not too dry and not to liquidy. A steaming wand is the only way to get the right consistency. Start steaming at the bottom of the pitcher of milk and slowly bring it to very the top during a duration of about 7-10 seconds. It needs to be a bit heavier than a cappuccino. After the shots have poured into the cup, you hold the steamed milk pitcher about 6 inches above the cup and begin to pour, slowly move the pitcher closer to the cup. By the time you reach the cup, the brown foam should reach the top and the last bit of foamed milk should make a small white dot in the center! There you go, perfect flat white!