While your adjusting the actuator (as per Alyn's post, half hole lined up then tug to pre-tension), make sure the wastegate flap moves freely then plumb the turbo outlet nipple direct to the turbo bypassing the boost solenoid.
This should get you boosting to around 0.5-0.6bar.
If you boost to this, which is going to run with the actuator wide open, this should then prove that your boost restriction down to 0.4bar is not solenoid, wastegate or actuator related.
Have you checked the turbo to intercooler pipe for split/cracks ? If it's running a plastic hard pipe these can split and it may be expanding when hot.
Are you sure your DV is closing and not bleeding boost off ?
Swapping early and late MAP sensors will not work as the early one (with round connector) only runs upto about 2.2bar atmospheric pressure and the later is a 3bar sensor running a different scaling.
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