Hand 1's marginal because you've gotta go through a lot of people and your stack's a little big. Good cards to do it with though.

Hand 2 is very read dependent, but seems fine if you say they've been tight (and if you haven't been pushing too much).

Hand 3 I hate against most players. I'd just fold. If you have good reason for thinking you have good fold equity, maybe I could see doing this, but usually you don't.

Hand 4 is fine.

Edit: Assumed this was a push. Don't do this.

Hand 5 is a little risky

Hand 6 is fine.