AK preflop: to push or not to push

I know this is a rehashed topic, but I still think we can learn from a bit more discussion, or at least I can.

<25 hands on both villains
Both hands leave us OOP on flop.

Hand 1:
Now when I look at his name, I think he might be an FTR poster.

PokerStars No-Limit Hold'em, $0.25 BB (7 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($28.40)
Hero ($23.15)
MP2 ($23.90)
CO ($21.90)
Button ($9.50)
SB ($13.55)
BB ($6.65)

Preflop: Hero is MP1 with Khttp://www.flopturnriver.com/phpBB2/...es/diamond.gif, Ahttp://www.flopturnriver.com/phpBB2/...es/diamond.gif.
1 fold, Hero raises to $1, MP2 raises to $3, 4 folds, Hero?

Hand 2:
PokerStars No-Limit Hold'em, $0.25 BB (9 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

MP2 ($5.35)
MP3 ($20)
CO ($4.65)
Button ($13.65)
Hero ($27.65)
BB ($5.40)
UTG ($6.90)
UTG+1 ($22.90)
MP1 ($26.80)

Preflop: Hero is SB with http://www.flopturnriver.com/phpBB2/.../smiles/kc.gif, http://www.flopturnriver.com/phpBB2/.../smiles/ac.gif.
4 folds, MP3 calls $0.25, 1 fold, Button calls $0.25, Hero raises to $1.5, 1 fold, MP3 raises to $2.75, Button folds, Hero?

There's enough room in hand1 for a lighter 4-bet. I probably raise to 9 & fold to a shove.

Hand2...I just get nervous about the EP limp/3-bet. Unless I've got a read saying otherwise I assume that's KK+. Maybe too nitty, but it seems there's a lot of people who like to play KK/AA like that.

I dunno really though...I'm still learning how to play AK in situations like this and am rarely confident I made the right play.

Out of position I prefer to bet about 1/3rd of the money behind, then shove about 3 sec after the flop is put down.