I've spoken with several guys with body lifts since writing up the install guide. I've haven't heard of any binding and didn't experience any myself.
The steering shaft extends/compresses with a sleeve that houses two square pins. It's like a T shape that slides into tracks on the sleeve and allows for up and down movement, along with some side-to-side play. I've had it pulled apart and there's not much to it. With the body lift, the angle wouldn't change enough to cause binding in the sleeve or u-joint. It's possible you've extended the shaft too much which would require the shaft extender from Indy4x.
Try this: Slide the u-joint up from the steering box a bit to reduce the length of the steering shaft. Test the steering again to see if binding is eliminated. If so, install the steering shaft extender and you should be good.