Have a look of my previous video. take a close look at the depth of my partners' shot. Then check the depth of your shots in your video. You will find huge difference. I checked the first 6 mins of your video, only find one reasonably deep shot from you. Depth is the key for baseline shots, consistence>depth>spin>angel>power/pace.
The guy in my video, I cannot get a set off him in the first half year we played, as I couldn't match his consistence and depth. Now as I am as consistent as him and hit deeper than before, he give out much more errors. Depth is the key!
And, if you has to hit very hard to get depth, loose your string until most of your rally shots (70% of full power) would land beyond serve line.
And, about court position, http://www.youtube.com/watch?v=T4A5x...eature=related