I think PWO nutrition depends upon your goals. If you are seeking hypertrophy (weight gain or better yet, muscle gain) - PWO with the bcaas, aminos, fast acting proteins and glucose are in order. If you are seeking strength increase or increase power output without the extra weight - I don't see that insulin spike as important; just general nutrition that can be obtained from food sources. Just my opinion if it hasn't already been articulated by others.
All the best,