AK in 6 max SnG's

First of all, i think AK is the hand that loses me the most money. I find myself shoving with the hand all the time, especially when now I see that I shouldn't be. Here's two scenarios, the first one being the very first hand of the game:

Full Tilt Poker Game #6625284951: $10 + $1 Sit & Go (50357908), Table 1 - 15/30 - No Limit Hold'em - 14:38:37 ET - 2008/05/30
Seat 1: nickchim (1,500)
Seat 2: reclamator (1,500)
Seat 3: Dirty600 (1,500)
Seat 4: sionide (1,500)
Seat 5: The Shrog (1,500)
Seat 6: simzem (1,500)
nickchim posts the small blind of 15
reclamator posts the big blind of 30
The button is in seat #6
*** HOLE CARDS ***
Dealt to The Shrog [Kh Ac]
Dirty600 has 15 seconds left to act
Dirty600 raises to 100
sionide folds
The Shrog ?

And...



Full Tilt Poker Game #6625336406: $10 + $1 Sit & Go (50357908), Table 1 - 15/30 - No Limit Hold'em - 14:43:57 ET - 2008/05/30
Seat 1: nickchim (1,395)
Seat 2: reclamator (3,355)
Seat 3: Dirty600 (1,370)
Seat 5: The Shrog (1,500)
Seat 6: simzem (1,380)
Dirty600 posts the small blind of 15
The Shrog posts the big blind of 30
The button is in seat #2
*** HOLE CARDS ***
Dealt to The Shrog [Kc Ac]
simzem raises to 90
nickchim raises to 315
reclamator has 15 seconds left to act
reclamator folds
Dirty600 folds
The Shrog ?

I'm just looking for some advice on these types of scenarios with this hand, with no real reads on the opponents.

Honestly, I try to get all-in with both of these hands pre-flop. Especially 6 max when your opponents' ranges change significantly. Hand 1, I probably re-raise to 350ish and then evaluate, maybe folding to a shove. Hand 2, I probably just slam it in.