Hello guys! past two days i think and try found solution..

i have 911.1 with 3076.
after 4000 rpm car louse boost. before 4000 car have boost like 0.7 bar, but after 4000 boost go down. no any differents if i run with or w/o controller.
i do next: Disconnect the boost controller. Run the turbos with mechanical control
only to be sure it's working ok first. Connect the wg actuators directly
to the ypipe, no solenoid.
no any changes.
i cheak full system for leak. no leak.
somebody have same problems before?