*NOTE- the line i was talking about in the graph is the club speed. I was wrong to say it was the arm speed. Red is Hips, Green is Thorasic (abdominal area), Blue is Arms, Gold is club
This would a simplistic version of the club curve on that graph,
Its a parabola in shape, i marked 3 points, each of them possible points in time for impact.
1) before peak in speed, meaning your accelerating up to and past impact
2) at the peak, meaning your acceleration is zero, you are at maximum speed
3) Just after peak speed, your deaccelerating.
But if you look at 1 & 3, they are the same speed, meaning the ball will go the same distance if all other factors are the same. So the assertion that accelerating through the ball will give you more distance is false. The best thing to do would be is to live in that small range at the top, were your around the peak.
But a diagnosis at impact would be
Hips, thorasic, Arms are all deaccelerating greatly and have lost near have there rotation speed. All this speed is transfered into the clubhead. this is why the graphs have a progressively larger from hips to thorasic to arms to club, because its a transfer of energy from the ground up. But the key is, not to expend that energy way before the golf ball, like most amatuers do. I think the reason is they want to hit the ball so hard, so they try to accelerate into the ball and they end up jumping the gun so to speak.