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What is the spring rating for the actuator and how much boost are you able to achieve? Also, what are the wheel specs for those turbos? Post a log showing boost and wastegate duty cycle
 
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Regarding to spring rating , I really don’t know about it , but it’s built in with the actuator came out bl1050x

the boost was achieving 28 psi then not hold , it’s going down to 25 psi
As a rule of thumb you can double wastegate spring pressure in terms of boost achieved. Therefore, if you have 1bar springs then achieving 28psi may be a limit. This is also affected by the amount of preload placed on the actuator rod when it was setup on the turbo. The fact that boost hits 28psi and then drops shows the engine becomes less of a restriction as RPM increases and the turbos simply can't keep up with the engine causing pressure to drop. You can test the spring pressure simply by having the tuner set WGDC to 0% and then see how much boost the car makes. I would start there and report back.
 
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