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Sad to say, but at one point in time, I had found a 7 move solution, but never wrote it down, which is quite a shame since I solved it while I was recording all the other solutions.
One thing I'm considering, should I find someone with some programming skills, is to create a program that runs through all possibilities for 5 moves and either display the results in a somewhat image format, or simply display all possible results in text and try them all one by one. 5 moves will work the best for such a program, since only 2 full lines should be left colored in a correct answer. The total possibilities comes to roughly 100,000, which is okay for me since I have a good amount of free time at work to go through them all.
It only take 17 muscles to smile, but 43 muscles to frown. Give your mouth a workout.