A few things:
1) 7 tournaments is nowhere near enough of a sample to determine whether you legitimately have a problem with your play near the bubble. If you had just cashed one of those tournaments, you'd be cashing at a pretty average rate, so to go 0 for 7 isn't particularly bad, even if you were Phil Ivey.
2) Just based on the way you're framing this post makes me think that you don't understand poker at a very sophisticated level. When I see you say something like...
Quote:
Is there some point, when you have a decent stack, to just fold every hand, even big pairs?
I don't mean to sound rude, but the fact that you think that's even a legitimate question suggests that your fundamental understanding of poker is completely out of whack.
It's hard to come up with specific suggestions for you because you haven't mentioned any hand specifics at all. If I had to guess, you're probably playing way too tight, but I'd also guess that's one of many leaks you have rather than the only one.
I don't think there's any "specific tactic" that's going to solve your problem. You're looking for a magic bullet, when what you probably need is serious studying and self-reflection to identify and correct your game in a more holistic manner.
Suggest you spend some time reading the posts in this forum to get a sense of how players who really think critically about the game analyze hands.