You mean a rich spike, as the air has been metered multiple times due to the turbulent air, you end up injecting more fuel causing a momentary dip in torque and quite possibly a stall event.
TL;DR, install a Haltech Elite or S3 or R3, convert to DBW, throw all ancient shit into the bin and enjoy the car.
Can you pull logs of the actual idle fluctuations?
The previous logs you posted didn't show any idle issues.
Also if you can log idle duty cycle, idle state, injector duty cycle
If you block off the BOV entirely you will get reversion out of the MAF and get a lean spike instead of a rich spike as the MAF double-counts the airflow.
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