I agree the Kahr P380 when running correctly is a VERY nice little gun. Accurate for such a small gun, and has a great trigger.
I originally did what you described, ground the "nub" on the slide stop off so the slide did not lock back on the last round. It worked fine, but the replacement slide stop Kahr sent works just as well.
What HP defensive ammo have you found most reliable in your P380? Mine has a few issues with Speer Gold Dots, but has been 100 percent with Buffalo Bore HP +Ps.