The first hand you must re-raise. When I have AK with a smallish raise in front of me I always re-raise to get (in most cases) the garbage small connector and maybe small suited or small pairs out of the hand, then follow up with a continuation bet on the flop to see where you are in the hand.
The second hand, when the shortstack raised to 400 and had only 220 chips left, he was basicly all-in. He would not have folded being pot commited. You just got unlucky.
Just some advice.
When you make a large raise with anything less than pocket AA, you always leave youself open to a simple beat, by your opponent pairing an over card. I will raise when holding medium and large PP, but usually only 3 to 5x the BB. Players at the level we play at will call large and even all-in raises with Ace rag, and how many times do you see an ace on the board at PokerStars? It just saves you some chips when you have QQ and that A or K hits the flop and you need to fold. Good Luck.
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