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What wastegate are you using? Did you clock the turbo at all? If you did sometimes folks get the actuator stretched. I dont have expirience with the Blitz IDC but if its anything like the Profec and the like maybe you need to fine tune the settings. Had a similar issue with my boost and I just wasnt setting gain, and boost limit right.
Try throwing a manual boost controller on it and see if you can get over 15, and make sure your wastegate isnt stressed.
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