systo,
your winrate is directly related to how well you play the large pots. And quite frankly, the large pots that you've posted have been played terribly from street-to-street.
I think that you have a really good shot of becoming pretty good (and I'm not being sarcastic). You're thinking about the game, but you're currently coming to the wrong conclusions. Keep working at it and keep posting hands. You have to think things through thoroughly. Ask yourself "Why?" constantly. Why am I playing this hand this way? Why is my opponent playing this way? When you have the answers to why, you'll start making the correct decisions in the big pots.
Sorry for such a long post, but I've been thinking about your situation for a while now. btw, if any players better than me (read: almost everyone in this thread) disagree with anything I've posted, please tear this post to shreds. Thanks!