I assume you are referring to this video:I was just watching your video where you personally did the power draw. I'd like to see what your arm was doing during the shot, not just what happened to the balls.
NV B.65 - Power draw technique advice from VEPS I
Sorry my stroke isn't in view on that shot, but I think it is clear from watching the tip during both the backstroke and follow through that I am keeping my elbow still during the entire stroke and following all of the advice here:
draw shot technique advice resource page
One common problem people have is tightening the grip during the stroke. This causes the butt to rise and the tip to fall, which can lead to a miscue.I have a twitching problem and it tends to creep up when I'm drawing a long ways. This makes my shoulder rise and that naturally lowers the tip and MISCUE! Some days I can't get rid of it; others I'm fine. I'm working on feeling the weight of the butt in my hand along with a better shot thought and that helps me keep my whole stroking system in place. But still I sometimes lift the butt.
Good luck,
Dave