What Nismoid was saying, is the current positioning of your blow off valve is OK. You can leave it there.
He's running it in the same position as you are - on the turbo side - and believe me, he's running high power. If it's ok for his application, then you won't need to change it any time in the future.
What I meant, was if for any reason you have to redo all your piping, you should move it closer to the throttle body. Otherwise, just leave it.