which is the correct size bet in the turn?

I bet half because is 3betted and I have an easy push in the river, in Her range there are many A and K, if I bet 70/80% I Think he folds Ax no chiker, Kx and I don't now if He pays with flashdraw

​But in the river thera are many scared cards like Q, J and all spade

Opponent fish 60hands

limp 13 openraise 53

fold3b 50, call3b50

fold cbetflop 50, turn (-)

IPoker, 15/30 blinds No Limit Hold'em Tournament, 2 Players
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[b]Hero (BB): 1,465 (48.8 bb)[/b]
[b]SB: 1,535 (51.2 bb)[/b]

[b]Preflop[/b]: Hero is BB with 9:spade: 9:heart:
[color="red"]SB raises to 60[/color], [color="red"]Hero raises to 150[/color], SB calls 90

[b]Flop[/b]: (300) K:diamond: A:heart: 9:diamond:[color="blue"] (2 players)[/color]
[color="red"]Hero bets 150[/color], SB calls 150

[b]Turn[/b]: (600) T:diamond:[color="blue"] (2 players)[/color]
[color="red"]Hero bets 300[/color], SB calls 300

[b]River[/b]: (1,200) 7:heart:[color="blue"] (2 players)[/color]
[color="red"]Hero bets 865 and is all-in[/color], [color="grey"]SB folds[/color]

[b]Results:[/b][spoil] 1,200 pot
Final Board: K:diamond: A:heart: 9:diamond: T:diamond: 7:heart: 
Hero mucked 9:spade: 9:heart: and won 1,200 (600 net)
SB mucked and lost (-600 net)
[/spoil]