Too aggressive in home games?

[fishhead]

I think I botched a few home tourney last night and would appreciate some help from you guys.

Game setup: 100 chips to start with blinds accelerating at PartyPoker rates. Top 3 paid out of 9 players. Mostly loose, passive players with varying holdem experience.

Scenario 1:
4 players, blinds at 10/20. I just took a bad beat and am down to roughly T120. Two other players are shortstacked with T200 and T150. Big stack (usually very aggressive who likes to play sheriff and knock others out) limps in the CO . I'm on the button with KQs and push. Big stack calls with A2o and I get knocked out. Was this too aggressive? Or should I have waited for the other passive shortstacks to knock themselves out?

Scenario 2:
4 players, blinds again at 10/20. I'm shortstacked again after screwing up a JJ play and have ~T100. Dealer accidentally flashed an Ace when dealing which we threw as a burn card. I get dealt ATs on the button with only the blinds in. I pushed. Was I being an idiot to push when one of my aces was gone or was this a decent steal play? As it turned out, SB called with AQo and knocks me out on the bubble again.

Unrelated question:
My biggest leak is from the BB. For example, after completing with a full table of limpers with K8 and a K falls, what's the correct play early in the game? I usually bet, get reraised and end up folding, which costs me a bunch of chips.

Thanks!