I read your post on False's wall and from my point of view [might not be right] I think your biggest flaw is : "Taking too much of a risk late-game".
When you're holding such an advantage, realize that you musn't start to play predictable as people such as myself will capitalize on that. However, don't go for a hard dangerous read if you don't need to. Yes, if you get the prediction right, it's a guarentee victory. Get it wrong though and you're looking at a turn-around.
I don't blame you though. After today's battle, I went out to practice against some good players [THANK GOD NO MORE NOOBS WITH SHUCKLES] and I would find myself at a 4-6 disadvantage but I'd find that they'd play too safely or too rashly, which allowed me to catch right back up. However I ended up losing as I got too greedy, which is something that shouldn't happen :/
Anyways, don't bang on yourself too much man. You're a talented battler with a flaw. Everyone's got one lol