A9 iso fish, flop nut 2pr

villain is 50-3 over 20. Called 92s earlier, called bottom pair + backdoor on ace high flop, got it in on turned flush draw, doubled up by sucking out on nit on river.

I hate my flop sizing, too small. Agreed?
turn sizing? river?

$0.10/$0.25 No Limit Holdem
9 Players
Hand Conversion Powered by weaktight.com

Stacks:
UTG ($26.88)
UTG+1 ($25)
MP1 ($33.57)
MP2 ($10)
MP3 ($50.74)
CO ($22.90)
hero (BTN) ($28.72)
SB ($24.75)
BB ($39.19)

Pre-Flop: ($0.35, 9 players) hero is BTN
2 folds, MP1 calls $0.25, 3 folds, hero raises to $1.10, 2 folds, MP1 calls $0.85

Flop: ($2.55, 2 players)
MP1 checks, hero bets $1.80, MP1 calls $1.80

Turn: ($6.15, 2 players)
MP1 checks, hero bets $5.60, MP1 calls $5.60

River: ($17.35, 2 players)
MP1 checks, hero bets ??,