Many golfers have long backswings where their arms keep going, keep in mind that your arms should stop swinging when your body stops turning, shortening your backswing will increase the radius of your swing and actually give you more distance
Think of your body as door hinges and your arms extended out as the door, when the door opens there is no roll in your arms, the toe of the club starts pointed up and goes back and through the same way, this is how your backswing should function
Hitting the sweet spot of the club is critical to distance and trajectory so if you are consistently hitting the heel or toe there are several basic mistakes you can easily change