the pressure feed is the hose that comes off the side of the manifold and goes to your 'T' join. I would first connect that straight onto the actuator take car for a spin and check the boost level to ensure you have a good pressure feed (i assume you have a boost gauge) and that its not running a high boost level to start with
charcoal canister
Definition: A storage device in the evaporative emissions control system. It is a small cylindrical or rectangular container that contains activated charcoal particles. The charcoal traps gasoline vapors from the fuel tank (and carburetor on older vehicles). Later, the vapors are purged and drawn into the engine when the vehicle is being driven.