First, I don't think GM does a good job at this on factory cars/tunes. Someone should be beat with a cane for letting some of these new cars leave driving so poorly.
The problem is after leaving a prolonged idle or while using rev matching; Immediate Engine Torque Source will change to axle and in that mode specifically the TM Spark advance corrections are entirely too aggressive. If you creep a Gen 5 car around in a parking lot you'll feel it either dragging like the brake is on or you'll get what feels like fast torque exit on gen 4 cars. Its quite literally a TM induced bucking. The timing will bounce some 20 degrees and when the mode returns to none it goes from subtracting 20d to nothing giving you a bang.
We can fix this by limiting by setting TM spark minimums higher but this is not a good fix because there are other TM's that should be allowed to pull the full amount.
Can we please have the gains to this torque management? Maybe it is a look up table torque error vs. retard? IDK