Well, it all roots back to my old swing which was very flat. Therefore, I worked on getting more upright using the feeling of having the club go straight back. Using this swing thought for a extended period of time made me develop this "hip bump" which in turn developed "down-lag". The reason is because my arms and club are still going up while my hips and lower body start to unwind therefore creating lag. I have now gotten my swing into a better position for consistency, i.e. more on plane backswing which has lessened these habits. As for a feeling, its really something I've just always done, but I can describe it as if you were using a whip and were unwinding your hips while still in your backswing. I'm sorry I couldn't describe this better, it's really something I do by habit and not really by "thinking" of it.