Domino's pwo FTW when bulking??Good info right here.
I typically just do 40-60g of whey isolate in water (+ 5g creatine monohydrate and 5g glutamine, just because I have it). So, there aren't any carbs coming in and natural GH stays high. If I'm focusing on bulking, I'd add in the dextrose or WMS and not worry about the natural GH. No carbs when cutting, carbs when bulking (assuming it all fits your macro needs).
I don't know how powerful natural GH really is, so I wouldn't worry much about blunting it if I'm trying to grow after a heavy lifting session.