If you're an inquisitive type, have some recollection of geometry and trigonometry, Google "Ackermann and Slip Angle". Or "Pro and Anti Ackermann". There are plenty of video explanations about the effects of changing the inside and outside tire angles and how this effects steering throughout the entire process of making a turn. You may have to sift through a few different explanations to get one that has a nice blend of technical jargon, without over explaining, based on your knowledge level of geometry and trigonometry. Yet, once you get a basic understanding of what slip angle does and how altering the Ackermann affects that, you can better appreciate how the changes in the .4 are affecting the steering, not reducing it to numb the car.

Tekno did the hard work in figuring this out and redesigning the Ackermann plate and Bell Cranks to change the inner and outer wheel angles. To fully understand it, you have to take in more than just servo speed and end point adjustments.