L1 bonus point tourney-reasonable to commit allin w tptk?

[RED FACE]

No reads

NL Texas Hold'em Trny:18307968 Level:1 Blinds (10/15) -
Seat 9 is the button
Total number of players : 9
Seat 1: ( $880 )
Seat 2: ( $870 )
Seat 3: ( $1000 )
Seat 4: Hero ( $1000 )
Seat 5: ( $985 )
Seat 6: Villain ( $1100 )
Seat 7: ( $1325 )
Seat 8: ( $865 )
Seat 9: ( $630 )
Trny:18307968 Level:1
Blinds (10/15)
** Dealing down cards **
Dealt to BodiceRipper [ Ad Ks ]
folds.
Hero raises [120].
folds.
Villain calls [120].
caller#2 calls [120].
caller#3calls [120].
folds.
folds.
folds.
** Dealing Flop ** [ 8s, Th, Kd ]
Hero bets [340].
Villain is all-In [980]
folds.
folds.
Hero is all-In [540]

Did I bet too much on the flop? Is this an easy but painful fold to the raise? I reckon I'm probably not against a draw and hoping to chop or maybe even be against KQ or have outs vs 2 pair. I think if there were less callers pre I would've bet less on the flop and been able to get away from a push. Is everything fine except my call which is horrible?

thanks