Not sure I understand your measurements yet.
The adjustable track bar is used to center the axle. So as a general reference, you can use the inside wall of the tire to the frame distance as your point of reference.
There might be more precise methods, but this will get you close.
You adjust the track bar to push or pull the axle to either side until those measurements are equal.
The two tie rod ends are primarily for adjusting toe in. They can, to a certain extent, be used to center the steering wheel, but that is not their primary function.
The adjustable draglink has only one function, and that’s to center the steering wheel after any changes to the suspension ride height or steering components have been performed.
So my first step personally would be to center the axle with the trackbar.
Second, I would disconnect the draglink from either the Pitman Arm or the tie rod and center of the steering box.
At that point, make sure that the steering wheel is also visually centered. If not, correct that and from then on, you can use the steering wheel to verify steering box position.
Then adjust and reattach the draglink without moving the steering box.
Replacing the lower spring cups may, or may not help the bowing of the spring.
Sometimes the bowing is due to the axle being off-center, and sometimes it’s due to the amount of lift having caused the axle to pivot and twist the springs.
This is normal and common. So don’t replace anything just yet. Find out what’s causing it first.
Then you may just have to live with it.
