I bought a frozen bag of chicken breast it has about 8 breasts inside.. each breast is 250 calories according to the food label.. i cook 2 at a time and today when i cooked, one was way bigger than the other one.. would u guys recommend that i buy a scale for weighing chicken breast to get the right amount or what?? i'd hate to be this strict and have to weigh everything but if the difference in chicken breast sizes really throw off my calorie intake i might have to..