Bodog 27+2 MTT: KK vs chip leader

[Rex Ruthless]

reads:
- tourney chip leader in BB has made some loose calls and hit some big hands (~20000 chips)
my image - tight (~7000 chips)

blinds 150/300
100 out of 400 or so players remain; top 45 get paid; I am playing for final table

I get KK utg + 1 and raise to 1000.
Folds to chip leader in BB who calls.
Flop 665r
checks to me, I bet ~2000.
turn is an 8, putting 2 spades on the board
checks to me, I figure almost 1/2 my chips are in the pot so I feel I am committed and push all-in, half hoping he'll call with a draw and miss to double me up
BB calls with A6o and I miss my miracle K on the river

Anyway to not lose all my chips on this hand? Help me to play it better? Or just chalk it up to bad luck?

Don't post results.
Don't post bad beats (in this forum, at least).
Don't be results-oriented.
DO go broke with that hand everytime.

[Rex Ruthless]

not meant to be a bad beat; just wanting advice if I should have played more cautiously versus the loose guy who could bust me - thanks though for the advice that I should risk going broke on the hand

Please don't post results.

I raise less preflop at the t150/t300 level on Bodog (with any hand, not just because you happen to want a call this time). My standard raise here is to t800 as I find that that's get about as much respect as a t1k bet and is cheaper. In general, as the blinds get bigger relative to the average stack, your raises relative to the blinds can get smaller.

I like the pot bet on the flop.

I might check behind on the turn, but only with the intention of calling his river push. If he bets less than all in on the river, I might just call, but probably push hoping for a call from a smaller PP or 45,A5.