Good shooter skills , tight grip and extra brand of ammo just encase what you have is not liked. Some of wwb or cheap fed from time to time don't run well. Clean it up well and relube. Maybe a slip on grip aid for helps with control as round count goes up. Some of us cheap out and use a piece of old 1.75 bike inner tube. Free at a bike shop for used tubes.
I know that the manual says to use only the slide release but you will find most all will sling shot. Just need a full pull and clean release. I have 3 kahrs and all will sling shot. Some brand new, some after a 100 rounds.