I think I have this problem too, but your wrist is already bent as you take your racquet up.
Andy Roddick's serve slow motion
Watch the first few seconds of Andy Roddick's serve in the video above. You'll see that he points his racquet head up (to the ceiling/sky) and only starts to drop the racquet as his body moves forward. Your racquet head is already dropped down and your wrist bent at about 90 degrees when you get to the trophy pose (hit pause on the video as the ball tosses up, and you can see this). This makes you more like to hit the ball like swatting flies.
Also, although your shoulders are sideways (always a plus) in the trophy pose, most top players have their shoulders rotated more so that your shoulders face more to the back fence instead of the right side fence.
Tommy Haas slow motion
Pause the video at second 16. We are looking at Haas side on. His right shoulder is further back than his left shoulder. If we took a video of you, your torso would be faced towards the camera and you shoulders parallel since you set up sideways. The most extreme example of setting the torso so it aims to the back fence is John McEnroe who simply set up with his body faced backwards. You don't have to do that, but you can see pros do this.
There's one other thing pros do, and I think it's extremely difficult to master. As they swing, their chest points upwards towards the ceiling/sky.
Not being an expert, but I'd probably address the problems in the order mentioned (the wrist angle first, then getting more shoulder rotation in the trophy pose, etc).
It does look like you are holding the racquet with an Eastern forehand grip, and you might want to rotate it over, though I would worry more about the wrist bending first.
At least you seem to have the knee bend and jump reasonably well coordinated. That's always tough for players, and I'm at a level where I don't do it well.