Terence Query

Hi Apologies if this is in the wrong place. I am going back through all the Angry Birds Original levels having lost access to my original saved scores. I am as far as The Big Setup and am having some problems following the guides on ABN. My Terence doesn't seem as powerful as the ones on the videos - I think I keep hitting the so-called "sweet spots" but to no avail. Does anyone have any advice on how to make Terence work as fast and powerful as the videos by @e-star (amongst others) show ? Thanks in advance, Ben