Please help --what are the symptoms of a bad -rack and pinion

Hello-while iam driving down the road and hit a bump or small hole in road -the front end kinda feels like its jumping to one side or the other and the steering wheel****** hard --the bottom control arms have been replaced and the ball joints are made into the control arm so the ball joints are new -- the top control arms and ball joints are not new but appeare to be in good condition-- I did a phsycial inspection with a pry bar to see if I could get them to move to find out if there was any- free play -(Loosnes)- -no freeplay was found in the ball joints--- the outer tie rodes are not loose and have no freeplay --the front end does not make any weird noises when I hit bumps-- and the steering wheel is straight with the car and it doesnt pull to one side unless I hit bumps or taking off-- and when I take off from a stop light the steering wheel pulls bad and kinda feel like wheels are? Fighting each other maybe?---And when I make a sharp turn in ether direction the wheel pulls it self over hard -