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This is one section of our Gearhead'* photobucket account. Compare your hookups to these pics and make sure you have it right.
Also check the vacuum fitting under the nosedrive of the supercharger.
At idle, disconnect the top vacuum line from the BCA (boost control actuator, large round black thing in this pic):
......and make sure as you disconnect/reconnect that the BCA travels fully, and actuates the bypass valve in the SC a full 90°. Report back what you find.
After that, disconnect the LOWER line (shown in yellow here):
......and plug it at the end of the tube, leaving the other end attached to the BCS (boost control solenoid). This bypasses the PCM'* ability to dump boost. See if you get full boost. Do NOT drive like this full time. It'* a troubleshooting step that could lead to damage.
Let us know what these steps do for you.