I'd double check your boost source (what the boost hose is connected to), and also check your source balance. Snow has Stage 3 controllers that use a mix of boost along with fuel rail pressure, injector pulse width, etc. to determine the proper amount of meth injection. If you want it based on boost only, set your controller it to 100% boost. If you have Snow model 320 or 3200 and want to also use fuel rail pressure, check that the blue FRP wire from the controller is securely connected to the blue/brown wire at the ECU.