RE: vinal top cleaners
First off, Welcome to Jeepz.com! but unfortunately I can't answer all of your question. I have never heard of the steering wheel steering BEYOND the max left or right... not to mention with the ignition off. Something is def. not right (duh), my 91 steering wheel locks if I try to turn the wheel when the ignition is off and I'm runnin 36s. I don't think your 33s have anything to do with it, maybe just coincidence? Was this happening before you put the larger tires on it?
As for the steering box, It will handle the 33s for a while. I know pleanty of people with the stock box and 33s or higher. My box went bad about a year after driving around on the 36s... upgraded to an ARG box. It's one beefy box and it will last you forever, so I've heard.
Hope this helps
Joop