power steering problem

[3.0trd]

I have an 89 N/A manual. I cant steer this thing to save my life. even driving around town, every bump and imperfection is amplified through the steering column, and cornering? forget it! half way through the corner I have both hands on the wheel, praying that the vibration and shaking wont overpower my arms. I replaced the steering rack today, and there was an improvement, on straight and slightly curved roads I can control it, but hard cornering is still out of the question. My ps pump has been flushed twice, makes no noise whatsoever, and turns effortlessly while standing still. Could it still be the pump?