I've been thinking about your earlier post all day, since I often have very good/ great Zen games where we lose, and it's tough figuring out what I could have done better.
So, I've been paying attention tonight: I just got out of a game with 5 medals as Zen- 3 Golds and 2 Silvers. I was solo-healing and was on my game. We lost in 5 on Oasis in Overtime. What I noticed, throughout the game, was that- even though I was kicking ass with Healing and DPS- I was a second late on about 5 or 6 Healing Orbs, and those guys died. We probably would have won if I had been that much quicker, no matter how awesome I was otherwise.
So that's my advice, find where you can improve, even if it's by the smallest amounts. Stay alive better, even if it's .1 deaths per game better. Keep your view open, don't tunnel, and get that Orb on your guys and their guys as soon as possible. Also- peak/ alt-fire when you're not in the middle of the shit.
I've watched the vids you've posted, and you are correct in that you are better than where OW keeps you, but you also throw your hands up too easily. Don't tilt, even in micro amounts, and just improve as much as you can each game. You can and will climb.
Good luck, I'm rooting for you.