I believe the root cause of the Norinco issue is the frame rails are too high, forcing the slide high. The result is less lug locking surface and/or the barrel rides the link. That combined with the softer barrel steel leads to the lug setback. The gunsmith barrel uses the fact that the barrel has excess material used to fit a barrel to a pistol to solve the issue; the other way to fix it it is to lower the frame rails. That is a lot more work.
The Norinco barrel is actually good; it is about as hard as a Mil-Spec WW II barrel is. The issue is that the barrel was not fit to the pistol. The slide is much harder than a Mil-Spec slide. So while a Mil-Spec pistol may have worn both slide and barrel lugs together during initial firing and engaged all three lugs to improve fit, the Norinco slide just moves the soft barrel steel and has engagement on only two lugs.
I am going to drop a modern (with the dimple in the feed ramp) Colt barrel in and measure lug engagement and end shake. That will prove if the theory about the slide rails is correct as Colt usually has great lug engagement.