Since the answer hasn't arrived yet.....
Based on the clues I instantly went for some type of coolant consumption based on the white smoke - but we can't smell through this site yet, so I can't be for sure. Throttle body or head gasket seeping?
The reduced power on DIC could also lend to an electronic failure caused by a rodent? Maybe the mass airflow sensor, throttle body wiring, or injectors themselves.
I'd like a pic of the engine compartment and a video of the run.
But, as
@OR VietVet said, puzzles are fun! Good game!