Efren pretty much uses only his index finger and thumb...the rest of his fingers just curl around the cue, but don't really contact it. Ronnie Alcano uses just his thumb, index and middle finger, with his ring finger and pinky hanging out in the air. Lots of ways to skin the cat. Whatever works for you is best...but when you're knocking the rails off the table and can't figure out why, it's often either alignment (foot position) or something going on in your grip hand/harm. An unintentional curling of the wrist, drop of elbow or tightening of the grip mid stroke can be devastating and hard to self-diagnose...