I had the same problem with my narrow front 756. It would "catch" as you described. At the advice of the IH service manager, I removed the bolster and replaced it with a wide front from a newer model IH. The 756 bolster containers the power steering unit as well as the steering gears and He said there could be expensive to repair. He recommended I stop driving it for safety reasons.
The newer wide fronts such as those from the 86 series tractors will fit with some modifications. The power steering units on those are located outside the bolster. A much better design.hope this helps.