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Folks are correct in this thread. Your O2 sensors are picking up way more air than what used to be there post turbo after your DP was installed. This information is sent back to the DME as short term fuel trim (STFT) which the DME uses to calculate how to maintain the target air to fuel ratio (AFR). This results in asking for more fuel and a weak point on the early B58 is the high-pressure fuel pump (HPFP). You're not making the required target pressure (2800 psi) under fuel load so the DME is closing the throttle to prevent a lean condition (a good thing).
Either lower the boost or upgrade your HPFP (my recommendation is Dorsch Stage 1).
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