Villain is a donkish 25/4/.7 over 100 hands, no history. I'm a 20-tabling rakeback monkey so I obviously don't have time to think about decisions that require more than 3 seconds of musing. We know his exact hand, but what gets the most value? Small turn, shove river? Shove turn? Check behind turn, 2/3 pot river?

PokerStars No-Limit Hold'em, $4.00 BB (8 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Hero (Button) ($465)
SB ($450.70)
BB ($400)
UTG ($287)
UTG+1 ($295.25)
MP1 ($630.30)
MP2 ($569.60)
CO ($389)

Preflop: Hero is Button with 10, A
1 fold, UTG+1 calls $4, 1 fold, MP2 calls $4, CO raises to $20, Hero calls $20, 3 folds, MP2 calls $16

Flop: ($70) 5, 9, 4 (3 players)
MP2 checks, CO bets $45, Hero raises to $137, 1 fold, CO calls $92

Turn: ($344) A (2 players)
CO checks, Hero has $232 behind