Chris, another thing you should look at is the AVC-r. I had the same problem with it because it was in self learning mode. Just turn off the self learning and set the duty cycle and boost and you should be good to go. I was having this problem running close to 2 bar.
boost leak. boost leak. boost leak. its a pain, use a soupy water and spray on vacuum lines to find them. dont just check vacuum you can reach, there are vacuum lines underneath the intake manifold and turbo thats hard to reach but it could still leak