Well first off Taking in High GI carbs with protein and complex carbs will cause the GI index to drop a lot depending on what exactly you are doing.
I feel the best thing and my trainer agree's as well. Immediately following your workout I have 75 gms of Cell -Tech, followed by my post workout shake which consists of 50gms Isopure protein, 130gms Maltodextrin, 2 tbs flax oil, 2tbs glutamine, mixed with water...You WILL grow from that. Then an hour later a low fat meal like Sushi. Youll have to adjust your requirments I wiegh 214lbs @ 5-6 % BF, 5'9
Give that a try for 1 month I garantee you will put on wieght.