Losing boost and shuttering

[MrHill]

Hey guys,
So since I've gone stage 3 with SRM K24s my car has been "screaming" at around 20psi, it sounds like a jet engine is the only way I can describe it. So I figured it would be a boost leak, which I did find and fix but it's still doing it and now once I hit 20psi it drops to 15 and if I stay WOT it shutters so I let off. When I first got the car back together it would boost 27 psi but still screaming, now I can't get past 20 for more than a second.
I've pressure tested the car atleast 10 times and am unable to find any other leaks. I've replaced the tbb, diverter valves, bi pipes, and ic hoses. I also made sure the wastegates were opening at the same time, around 15 psi. At WOT my afr is super rich, about 9.0. I'm running a base tune from Blake
Car runs perfect otherwise.
New plugs gapped to .026 and coils.
If anyone's got any other ideas I may be overlooking I'd appreciate it. Thanks

[oppositelock]

Sounds like an exhaust side leak. Could be between turbo and manifold, manifold and head, or CHRA and turbine housing.

[Zba]

EGTs tight? O2s tight?

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EGTs tight? O2s tight?

Turbo to downpipe tight?

[Corradovolksb]

What pressure have you pressure tested to? I had a similar issue after I installed my K24s and SRM intercoolers. The upper clamp at the intercooler was not fully tight causing a loud whistle noise similar to a failed turbo. Once it tightened the shit out of the clamps the noise and boost leak was gone and had stayed gone.

[MrHill]

Everything is tight, but it could be the manifold to turbo metal o ring. Really don't wanna pull the motor again 😞
I tested going up to 30 ish psi