Hello guy's. I have misfire on high boost. as soon as I disconnect the boost controll valve and have only 1.0bar boost pressure, the misfire are gone. Spark gapped to 0.7mm, new leads to coil did not solve the problem.

Car is Running Sabre stg.2

380S Turbo
630 Deka Siemens injectors
Fuel pumpe
200cell cat

What can produce the misfire?