Time your shot so that you squeeze the trigger after your heel touches down and your foot is stepping flat that way you have a more stable position. Don't shoot between steps when one foot is in the air.
"If violent crime is to be curbed, it is only the intended victim who can do it. The felon does not fear the police, and he fears neither judge or jury. Therefore what he must be taught to fear is his victim." - LtCol Jeff Cooper