BAD Boost creep on BNRS4, is this normal with these MODS?

Ever since I got this turbo (BNRS4) from a buddy and installed it, I've been getting boost creep all the way to 22 psi on spring pressure. The internal wastegate is opening, but not enough to vent the boost built. By swapping out a new one, I've already verified that the wastegate actuator isn't the issue. When I pressurize the line, the arm will open the wastegate, but it still isn't venting enough.

When I disconnect the actuator rod from the flapper arm, the flapper arm opens all the way seemingly without resistance or hitting anything. I verified that my EBCS is routed correctly. Also, if it was to fail, it would fail open to spring pressure.

Here's a chart showing the boost under WOT:
Keep in mind, this is WGDC 0%

Is this expected with my high-flow exhaust and intake setup or should the IWG on the BNR be able to keep up?

Here are my mods:

TurboXS Catless Downpipe & Racepipe
Cobb CBE
Autotech HPFPI
BNRS4v3 turbo
Grimmspeed 3-port EBCS
ETS TMIC
GoFastBits T9002 BOV/BPV
HTP 3.5" intake
Damond Motorsports Stage 1 OCC with VTA
Damond PCV Plate
Cobb RMM

Nearly FBO except for a few motor mounts and the intake/exhaust manifolds.

Tuned by Ilkka @ Atenza Tuning, on Cobb APv3

TIA everyone!

 

Have you confirmed that wgdc is 0 in a log?

 

Yes, I have. It reads 0 all the time, regardless. I have tried manually bypassing the EBCS and directly connecting the hose to the wastegate pot and it did not change my boost creep either. Not a EBCS issue as far as I can tell.

At this point I feel like either I just need to go with a manifold and external wastegate, or there’s something up with my turbo. However, I thought I’d check with y’all prior to making a decision based off my troubleshooting.
Here’s a link to a WOT log in 4th to confirm for yourself.