I agree you have a pretty, splash free stroke. It's wonderful to watch.
I'd suggest working on the same thing I did just a few days ago. on your entry, your palm is turned slightly to the outside. In the underwater view, this outside facing palm continues on your pull through...sending water ot the outside of your body line, rather than behind you. Most of it is sent behind you, but if you correct this slight angle, I think you'll find a pleasant addition of propulsion to your stroke.
it's more than just a matter of correcting the hand on it's entry and followthrough...but the body works symmetrically...so by entering with the palm slightly facing out, the opposite palm will reflexively face out as well. By fixing one problem, you fix the same issue on the opposite side simultaneously.