Jerk: Connect the Bar to Your Legs
Think of the jerk rack position as a way to connect the bar directly to your legs.
Anything that disrupts that connection means less force into the bar and less control of where it goes, just like the tires of your car spinning when you stomp on the gas.
This means ensuring a secure rack position with the correct bar placement, and being braced forcefully to keep your trunk rigid throughout the dip and drive.