Wiibak, I watched your first video and the latest one with no sound. The first 15 sec has showed me that your wrist is too high as supposed to be lower than your 5 knuckles. Another words, your hands should be almost rest on the key surface, especially your where your palm is facing. Occasionally that wrist is allowed to move upward/downward as so called "end of musical phrase". Anyway, its not a bad idea try to play the same tune as you did with flat hands, slowly just using flat fingers, yes fingers are almost straight-a deliberate practice to strengthening your hands structure. Later on, practice with curved fingers. You will find the combination of 2 gives you a big plus in your playing. So just relax a bit and drop your hands a bit...for the time been. Post as one more video after you have done your changes. I hope this helps.