Try adjusting the hood bumps like the other poster suggested. Maybe the car is twisting with the torque of the engine when giving it gas. This is a easy thing to try, start with a half turn (counterclock wise), if you turn too much they will just come off and you can just screw them back in. Just did this again to stop my hood noise, not much adjustment left, might have to glue some small piece of rubber on top to make them taller.