NL50 TPTK vs fish shove

Ongame Network $50.00 No Limit Hold'em - 3 players - View hand 1710242
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BTN: $57.07
Hero (SB): $65.55
BB: $32.45

Pre Flop: ($0.75) Hero is SB with K A
BTN calls $0.50, Hero raises to $2.50, 1 fold, BTN calls $2

Flop: ($5.50) 8 9 3 (2 players)
Hero bets $4.50, BTN calls $4.50

Turn: ($14.50) A (2 players)
Hero bets $11.00, BTN raises to $50.07

Ongame 3m tables.

44/10 3b 0 ~200 hands
fold flop cbet 52
AFQ 41
wtsd 27

I'm betting big flop as I'm hoping he could fold weaker hands like 2x, 33-55, maybe that's too ambitious and could make it small. He didn't looked super spewy, playing postflop only when had at least something and definitly not passive.