'75 Duster steering issue

Guys
Purchased a '75 Duster from a person that put a power steering unit in the car. The power steering and associated idler arm were from an earlier (pre 1973 small pitman arm) car. The car drove and steered fine. Many years go by and the steering box starts to leak badly. I scored a new post-1973 steering box that takes the larger pitman arm. Purchase a Moog pitman arm and install the steering box. The idler arm was in very good shape, replaced a few years back and not changed. Take the car to the alignment shop. I have fresh offset bushings in the A arms to achieve better handling specs for the radial tires. They set it up to my specs for a performance alignment.
Problem is when I drive the car and turn the wheel in either direction all the way L or RIMG_6228.jpeg , the wheel is very lazy to return to center. Is there possibly an issue with the length of the idler arm being different? Has anyone experienced this? Seems like the car just needs more positive caster to return to center.