The club swings on an incline angle, it does not swing "down" towards the ball. When you transfer force to counteract the swinging club, be sure you are pushing away and not "up."
What happens to the driver after impact? If you intend on increasing speed, your arms will allow the club to re-hinge. If you prevent this, you increase tension, which slows down your swing.
Step 1: Create Width. Step 2: Push away - transfering force away from the direction of the swing - not up. Step 3: Re-hinge the club; this requires relaxation, which increases speed.