That is caused by driveshaft rotation torque, same thing as a drag car.
It is more prevalent when you have deeper t-case gearing, higher axle gearing, bigger tires, softer suspension, more power and lockers/spool.
I see that your dual rate nuts aren't adjusted.
In the front put them 1" away from the slider at ride height.
In the rear put them 2.5" away from the slider at ride height.
This will help with the roll, bottoming out and the torque lean.
Next step is firmer shock valving. I can re-valve them for free, or I send you the disks if you can do it.
Final step is a sway bar, cool things coming, but probably 6 months away.
Or TK1 or Performance... (no personal experience with either)