screws, shelves and shorting isolation

I know this has been covered some, but I couldn't find it by searching. I am wanting/needing to put up some shelves in my studio, but I know (I think) that putting screws through the layers is going to short the isolation somewhat. The question is how much? Especially if I take care to put the screws through to studs, since the two layers are screwed together at the studs anyway. The two layers are 3/4" OSB and 5/8" gypsum on 16" wood 2" x 4"'s. Thanks! Scott

As long as you don't shortfuse 2 different layers, it's okay. So, your plan looks fine. No worries!