50NL - TPTK facing heat on river.

[Jayy]

Villain is 35/21 over 60 hands. Has folded to a lot of resistance in previous hands, thought this would be a good time to let him hang himself on a good flop.

Full Tilt Poker
$0.25/$0.50 No Limit Hold'em Ring Game
6 Players
LegoPoker Hand Converter

<font color="black">Stack Sizes</font>
Hero (BB): $84
UTG: $27.20
MP: $42.65
CO: $49.70
BTN: $79.20
SB: $51.75

<font color="black">Preflop:</font> A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img] ($0.75, 6 players) This is a re-raise a majority of the time, but is it horrible to flat call against this player?
UTG folds, MP folds, CO folds, <font color="red">BTN raises to $1.75</font>, SB folds, Hero calls $1.25

<font color="black">Flop:</font> 7[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/heart.gif[/img] ($3.75, 2 players) Alright I have my flop, hopefully he has AJ/A10 and a flat call here may get me more value on a non-spade turn. Should I be worried of him holding spades here?
Hero checks, <font color="red">BTN bets $3</font>, Hero calls $3

<font color="black">Turn:</font> 7[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/heart.gif[/img] [8[img]/images/graemlins/diamond.gif[/img]] ($9.75, 2 players) Good card. I can take the lead here with 1/2 pot bet, AJ+ calls here as well as another 1/2 on river.
<font color="red">Hero bets $4.75</font>, BTN calls $4.75

<font color="black">River:</font> 7[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] [6[img]/images/graemlins/heart.gif[/img]] ($19.25, 2 players) Doesn't look like it would scare off villain, another 1/2 to take it down.
<font color="red">Hero bets $9</font>, <font color="red">BTN raises to $30</font>, Hero ? (What the hell is this?)