Update: after a couple of days, it looks like the ECU is still adjusting. Driveability improved a bit, idle now drops to 500-600 instead of 400-500 rpm.
My tuner will be coming over tomorrow to try and fix the injector scaling. Keeping my fingers crossed!
I also spoke to a buddy of mine with a Full Blown turbo kit tuned by the same tuner, he says he also experienced the idle dip. But it went away after a week.
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