In case this happens to others on the forum, I haven't seen it before on here.
I had several spells of steering wheel Stiction after i replaced the disintegrated nylon bush with a poly item, usually on hot days after about 20 to 30 minutes driving. It was most noticeable around the straight ahead position.
I found a squirt of furniture polish on the polybush removed it completely. I expect it's the silicones in it. I don't know if the beige gunge that's supplied with suspension poly bushes has the same effect as I had none left.
Hope this helps,
Adam