I haven't tried any of the ammo you tested, so I was glad to see your results. I had been thinking of the S&B, but had similar accuracy with their 9mm ammo. Still probably a decent choice for range work if the price is right.
My own results have been mixed, but since at least some of the problems were my own fault, I won't go into it much. The 2 that I had 100% function with are WWB & of Remington L380A1B JHP. Both were reasonably accurate at 5 yards.
I expect my accuracy will improve over time, too. The trigger is much longer than anything else I own & does take some getting used to. At least it's a comfortable gun to practice with! (As long as I remember that a BandAid is standard range equipment. ;D)