Hi,
I love the animation and have wanted to find the time to model a yacht and animate myself. Here is a link to a youtube video (see from 01:07) of a yacht of similar size and speed and you can get a good comparison of what you have done and the real life wake and yacht movement.
I have a bit of a boating background and from my memory here are a few thoughts on the animation and small details that can help. I think you have missed a trick in not including both the ensign and radar, that could be animated bringing a bit more detail and realism. A little bit of pitch and roll in the boat movement would also help as it looks like it is just ploughing through the water, which never always happens even in the slightest of conditions and much larger yachts. The bow wake also has a turbulence and can be seen in the video clip.
You have made a great start!