Flopped trips going gay on turn

[Babalatexi]

Party Poker, $0.50/$1 NL Hold'em Cash Game, 5 Players

UTG: $282.91
Hero (CO): $103
BTN: $120.28
SB: $117.61
BB: $101.50

Pre-Flop: 9[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/club.gif[/img] dealt to Hero (CO)
UTG folds, <font color="red">Hero raises to $4</font>, BTN calls $4, 2 folds

Flop: ($9.50) 9[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $6</font>, <font color="red">BTN raises to $12</font>, <font color="red">Hero raises to $32</font>, BTN calls $20

Turn: ($73.50) 7[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $21</font>

Villain is 40/5/1.4 after only 35 hands so we just know he sucks. Reason behind my ridiculous turn bet? I think all villains would auto-bluff-shove here and shove the FD's too, all A's would shove too while they might check behind if I check. I guess a check could be justified here too but I think this gets most value out of villain's range. I don't like shoving since we lose the bluffs. I really doubt a bad villain could see me having a 9 here. Flame away.