A few things that seem a bit off here.
- why is there 2 BOV’s?
- the turbo smart BOV on the compressor housing, is it turned up ALL the way? I have seen this become an issue on old man Pete’s car. It would push open and recirc, turbo speed would rise and the boost pressure would do weird things.
- stock head? Does that include springs?
- tried a different MAC valve? Is it plumbed correctly?