Is it as simple as nipping up the adjuster on the steering box??
Mine had two faults, which made my steering too tight. The garage fitted a new steering coupling AND backed off the box adjuster very slightly. Made a hell of a difference.
So, conversely, tightening yours up might solve the problem.
You also mention axle replacement?? What about the swivel shims?? Do the swivels have the correct preload?? Was this checked, if not do before touching the steering.