To better show the backhand place your camera on the other side of the court.
I have one particular video observation that is seen in some high level one hand backhands but not in others.
1) Seen in the model 1HBH backhands of Wawrinka, Justine Henin, Gasquet and others. More early acceleration comes from the turning of the uppermost body and less comes from shoulder joint muscles. The checkpoint is that the chest appears to touch the upper arm and probably does convey forces to the upper arm there when the chest and upper arm move together in lock step. The arm is straight. Later before impact the upper arm separates from the chest from shoulder joint motion.
2) Seen in the backhands of Federer and Feliciano Lopez. The upper arm separates from the chest earlier. See the Federer analysis in the thread, post #138.
Your one hand backhand is more like #2 and your elbow is bent. Your arm can be seen separating from your chest earlier in #2. Compare this and your uppermost body turn to videos in the thread.
Here is a long thread on this subject. Read posts: #1 and #51 to end for videos and discussion.
One Hand Backhand - What Force to Start Forward Swing? I have just been watching great one-hand backhands at the Madrid Open. Including excellent slow motion that can be replayed in even slower motion or single frame with my DVR. Often when I try to swing forward for a one hand backhand...
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You should compare your backhand to the backhands of Gasquet, Justine Henin and Wawrinka with high speed video.
You can compare two videos on the forum by finding impact and counting back frames from impact. It is a little cumbersome because each time you click on a video it automatically starts playing so you must go back and find impact. For single frame on Youtube use the "
." & "
," keys.