Need more assist from Authentic Automotive original style power steering.

[tecteachr]

After installing the complete original style power assist kit I am not satisfied with the amount of effort needed to steer. The new pump pressure is okay. Control arms with built in caster, a 16:1 steering box & Coker radials were installed. All bushings, ball joints replaced. I realize caster & quicker ratio will increase effort. Can the valve be modified to give more assist? Alter spring pressure by installing a weaker spring? I would rather learn how someone successfully decreased effort rather than experimenting myself. I talked to Authentic Automotive when I first installed everything & was sent a new pump which had a higher pressure but the steering effort didn't change. I have never driven a 57 with original power assist but I bet it required less effort than mine.