Can u play faster by omitting 4th finger playing past 12th fret??My instructor w/34 yrs experience say's Do NOt USE 4TH FINGER ABOVE 12TH 12th FRET.Don't want to 2nd guess him but Hard for me to change. He also states nobody uses tips of fingers to play power chords even tho it's taught that way in books(supposed to make mini barre with 3rd or 4th finger)Whats Peppers take.