I've already tried using a smoke machine several times, with no luck. Spraying brake clean doesnt work on forced induction cars.

Im almost certain that their is a leak, what other methods are there to find a small leak(that possibly becomes exposed under boost)?

 

Hook up an air tank to the outlet ducting from the turbo with a regulator. Set it to whatever PSI you run, maybe a bit higher and look around all the pipes for leaks, maybe dab some soapy water on all the connections and look for bubbles.