Did you replace the power steering pump also? There are two pumps, they are piggy-back. The seal on the suction tube also needs to be replaced between the pump and the filter housing or it will suck air. BTDT.
I would also suggest that you clean the orfice in the safety regulator valve. Orginally there was a screen that helped keep the junk out of the orfice but most of them are long gone.