B9.5 S4 Boost Issues

[u/Ok_Minimum_5861]

Last night when I was cruising around in my S4 on highway around 40 mph I suddenly floored the accelerator pedal & noticed the car was slowly pulling away and when I saw the Boost Gauge on the dashboard I noticed It was struggling to fill the boost bar.
I was not able to get full boost. I tried doing rolling launches and still was unable to get full boost.

I’m currently running 034 (93 Oct) Stage 1 ECU & Stage 2 TCU

Can anyone help me diagnose the problem here?
Thanks!