It's usually the rack. Back in 1979 when it was designed, it might have been good, but it just isn't ideal. There are a few other rack replacements, but they aren't going to do much to make the wheels turn any further or quicker. It's also a matter of wheel well clearance as there isn't much there.

You can crank the hell out of the tie rods, but you're just going to end up with a retarded amount of toe out and still not solve anything.

If I built a road racer/drifter fox, it would have a Flaming River quick ratio manual rack, bump steer kit and one of their steering shafts (eliminates the rag joint).