Hmmm... 1/4 turn you say ... there's something wrong there.
Perhaps the valving in the steering gear and/or pump is out of spec somehow, or binding internally?
As I mentioned earlier, this excessive pressure is hard on steering linkage. Perhaps it's gotten to a point where the linkage binds up, and that you have to "steer back" to relieve the binding?
Are there any coolant or oil leaks that may be dripping onto the belt or pulleys?
If that belt has been squealing for a while, there's a good chance that it has worn thin and has gotten glazed as well. Try a new belt, and let us know if that helps.