How much gamble is too much? (two Legends hands)

[Tapin]

I play tournaments too tight, and I'm trying to work on spots where I could gamble a bit more. Any comments on these hands?

Hand 1: I've just arrived at this table and seen less than a full round. I've got a medium-sized stack at the table (~22k in chips), and the guy on my right is loose preflop. I don't have reads on anyone else yet.

150/300/50. Ten handed. Hero is SB with 6 [img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/diamond.gif[/img]
UTG Villain (Can Kim Hua) calls, 2 folds, MP2 calls, LP1 calls, 2 folds, Button calls, Hero completes, BB checks.

Flop (5 players, pot is 2000): 6[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/spade.gif[/img]
Hero bets 800, Villain raises to 1600, 3 folds, Hero calls 800.

Turn (2 players, 5200): 3[img]/images/graemlins/diamond.gif[/img]
Hero checks, Villain bets 2000, Hero calls.

River (2 players, 9200): 2[img]/images/graemlins/diamond.gif[/img]
Hero checks, Villain bets 4200, Hero calls.

Hand 2: It's now an hour later and I've chipped back up slightly to about 18k. I've only seen two flops, one of which I took down after pushing on a drawless flop (my opponent folded). UTG (~28k chips) hasn't been too involved, and hasn't shown any hands down. MP2 (~14k chips) limped a few times and folded to flop bets. SB (~8k chips) was the guy I pegged as loose preflop, and that's still the case an hour later.

150/300/50. Ten handed. Hero is BB with A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img]
UTG raises to 1100, 2 folds, MP2 calls 1100, 4 folds, SB calls 1100, Hero calls 1100.

Flop (4 players, pot is 4900): K [img]/images/graemlins/diamond.gif[/img] 9 [img]/images/graemlins/diamond.gif[/img] 3 [img]/images/graemlins/diamond.gif[/img]
SB checks, Hero bets 3000, UTG raises to 8000, 2 folds, Hero raises to 16225 all-in.

I hate the preflop limp in hand two, but I'm not sure whether pushing (representing a flush, but possibly with the best hand anyway) was a terrible mistake or simply a reasonable time to "be willing to die in order to live."

Comments?