Try adjusting your torque adders table. Reducing all cells by .1 should be noticeable enough to test.
Another way, they used to reduce the torque management torque factor from 1 to .8 should still be safe.
I haven't tried adjusting torque management myself.. (I've heard it protects the transmission)
But I have reduced the torque adders to get it to shift faster where I want it..
(Mainly copied some changes in torque adders from the '18 silverado, to reduce delays while trying to keep a smooth shift)