You have your caster adjustment on the bottom of the kingpins, do you also have adjusters on the top aswell?? Most dont bother with both, and most set them on top as its alot easier to access, if you have both fitted with dot 5, you can get alot more variation and set up more precisely.
Yes, set up is super important and I still have a ton to learn. Here is another video on the subject that maybe you have not seen yet: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_oBEgiYGwo4.html