Protein powder isn't really needed apart from the workout shakes. If you can, just get some cottage cheese before bed. Get the 2% one, it's tastier, less carb and the fat will slow its absorption even more. Some really fat plain yogurt (10%) could do the trick too. The flavored ones are usually full of sugar. Egg whites is also a nice protein "supplement"

Otherwise, I don't think that you need to mix all those 3 together. Just whey + one kind of casein will be plenty enough.