Correct. This is weight shift.Yeah, i think... the sinking rear would take more weight off the front hence giving the front less traction/weight being insignificant to the pull. Having a stable rear causes the front to remain steady to have a somewhat even distribution of weight since no end is sinking or raising, thus being efficient in the pull.
Is this correct?
More weight on the front results in more traction up front. At the same time less weight on the front results in more traction in the rear. It's all about balance and balancing the entire system.
In the case of lifted short arms and high antisquat and hops, the rear is lifting (axle pushing down into the ground) until it can't anymore, then it loses track traction causing the rear to fall, creating a cycle of hops. This results in instability and upredictability. The system is out of balance.
The same is true with the long arms and low AS described earlier. The system is out of balance.