Target versus Actual after often not the same. The target serves as a general goal for the car, but it cannot always achieve that. When you go full throttle at say 2000 RPM the wgdc should be 99% and the boost pressure goal around 13psi, although the car is actually producing much less boost pressure. This is a limitation of the motor, not a problem. Don't worry about it.
you may also want to look at, and replace, the vacuum T that goes between the turbo's compressor housing and the wastegate. These T's get fragile over time and a slight crack in it can create issues. The same applies to teh vacuum lines going to the wastegate, the compressor cover, and to the factory electronic boost control solenoid. If the lines are hard as a rock by the turbo, I would replace them. The only KEY thing is that you remove the restriction pill from the compressor side line and put it in the new vacuum line. Otherwise, the turbo will not make much boost over 8psi. More details may be found in Cobb's article here: