You have multiple issues with your setup.
The boost issue seems to be most important to you, right? So is your exhaust, free flowing 3in no cat etc?
If not, then maybe there's to much back pressure, or restriction to allow the exhaust to flow through the waste gate port hole even when flapper held open.
Free/inexpensive things you can try:
Unbolt part of your exhaust. (Catback) install a stock or adjustable waste gate arm. Set the boost for 1bar (14.5psi).
Sent from my Highly Tuned Note4!!!
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