Im practising a lot of scales right now, going up and down the neck covering every part of the fretboard. Some confusion arises though when i reach somewhere about the 15th fret, because my pinky can no longer comfortably reach the E-string. I don't want to practise using a poor technique so therefore i'm asking you how to go about it. It's obvious that thumb placement makes a big difference. I can improve my reach by either letting the thumb slide up on top of the neck, or letting it slide down below the neck. Which option do you prefer? Is it fine to just stop using the pinky above a certain fret? Or to practise to shift down the A-string rather than using the highest part of the E-string?