KK lost to A3o

Was slightly annoyed at this but as I was the short stack versus chip leader would it have been better to go all-in? I was thinking I could limp in the hope of getting more chips:
POKERSTARS GAME #2247443958: $5 TOURNAMENT #10822103, HOLD'EM NO LIMIT - LEVEL V (75/150) - 2005/08/02 - 17:52:28 (ET)
Table '10822103 1' Seat #8 is the button
Seat 6: ripbon (5655 in chips)
Seat 7: DrGonzo_101 (1075 in chips)
Seat 8: Cruz_J99 (1160 in chips)
Seat 9: knixonr (5610 in chips)
knixonr: posts small blind 75
ripbon: posts big blind 150
*** HOLE CARDS ***
Dealt to DrGonzo_101 [Kh Kc]
DrGonzo_101: calls 150
Cruz_J99: calls 150
knixonr: calls 75
ripbon: checks
*** FLOP *** [5c 5h As]
knixonr: bets 300
ripbon: folds
DrGonzo_101: raises 625 to 925 and is all-in
Cruz_J99: folds
knixonr: calls 625
*** TURN *** [5c 5h As] [6s]
*** RIVER *** [5c 5h As 6s] [Ah]
*** SHOW DOWN ***
knixonr: shows [Ad 3s] (a full house, Aces full of Fives)
DrGonzo_101: shows [Kh Kc] (two pair, Aces and Kings)
knixonr collected 2450 from pot
*** SUMMARY ***
Total pot 2450 | Rake 0
Board [5c 5h As 6s Ah]
Seat 6: ripbon (big blind) folded on the Flop
Seat 7: DrGonzo_101 showed [Kh Kc] and lost with two pair, Aces and Kings
Seat 8: Cruz_J99 (button) folded on the Flop
Seat 9: knixonr (small blind) showed [Ad 3s] and won (2450) with a full house, Aces full of Fives