On most 4wd 1/8 scales and the 2wd rb6 I have driven, more antisquat gives me more on power steering. Less anti squat on power gives me push push push.
My personal explanation (right or wrong) is on power, the hinge pin pro/anti squat, will tend to be parallel to the track surface, and depending on how its placed, will push the car on that end always tending to make the pin parallel to ground.
With respect to off power, I have not noticed significant changes to the way the car drives on changing anti squat setting. On power makes a world of difference.