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Weird DBW Behaviour & Remapping Simos 9.1 ECU

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Hi all,

I am looking to remap my first ECU, using the fundamentals from the courses on here, which im yet to finish. But first, I need to read and write the map.

The car in question is a 2006 VW Fox (1.2L Petrol) using Siemens Simos 9.1 ECU.

As in the image below, for whatever reason, the OEM map closes the DBW throttle body to around 45% under high load. This causes a pressure drop of -0.11bar in the manifold. I can see a lot of power is lost because of the OEM map. Visual throttle body inspection on dyno confirms the OBD readings.