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To smoothly drop RPM down to target the ECU subtracts a fixed non-user-adjustable number of steps off the stepper motor table value for about a second, and then adopts the table value for about a second, and then adopts closed loop control.
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If i am understanding that write-up correctly, the gm iac becomes non-linear with air flow/amount once the pintle reaches a certain position maybe, so that persons strategy to overcome gm crappiness seems to be to keep the pintle as close to the seat as possible and still maintain desired rpm. Sucks you can't control the pre-programmed idle smoothing decel feature because it seems that might be an easier way to custom tailor and help with your issue. Hopefully changing the clamping/lockout values helps.
Interested in seeing what AWD parts you decide to graft in there and yeah, work gets in the way of the fun stuff here too. Hope you are making progress with your build and tuning