No RTC (return to center) with steering, CPP

['68 Newtricks]

Details first:
LS swap with stock pump
CPP series 500 steering box
Stock center link with all CPP TREs
CPP modular spindles
5-6* negative caster
Tiny amount of toe in
Zero camber


Truck has no slack in steering, which is nice, but it's also tighter than (enter your own). The truck feels like a go cart, not in the good way, more like it's twitchy and takes concentration to drive. It also has no RTC, I mean ZERO. My big blazer with hydro assist has more and that's not right LOL. The '68 drives straight as an arrow but tends to wonder because the steering is so tight.

Before I pull the pitman arm off and try moving the steering, checking if there is a hang up some place, does anyone have any pointers or experience with this? If the power steering pump lines are switched, would it act like this or not even work? It takes some effort to move the tires while it's not rolling. More than one finger, spin the wheel kinda thing. It's not manual steering feeling, kinda between that and power. Even with manual steering, you still have RTC. ggrrrr

Any tips?
Thanks