Need post flop line advice

Villian is loosey goosey, never raises preflop, cold call of 46% after 40 hands. I realize I should've let this go preflop, but my image is tight and I like occasionally raising deceptive hands from MP due to gap theory.

So my question is, how is my post-flop line here?

Full Tilt No-Limit Hold'em, $0.10 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP2 ($7.80)
MP3 ($12.75)
CO ($11.80)
Button ($7.10)
SB ($9.25)
BB ($16.05)
UTG ($8.85)
UTG+1 ($16)
Hero ($11.50)

Preflop: Hero is MP1 with Thttp://www.flopturnriver.com/phpBB2/...es/diamond.gif, 8http://www.flopturnriver.com/phpBB2/...es/diamond.gif.
UTG calls $0.10, 1 fold, Hero raises to $0.5, 4 folds, SB calls $0.45, 1 fold, UTG calls $0.40.

Flop: ($1.60) 8http://www.flopturnriver.com/phpBB2/...iles/heart.gif, 6http://www.flopturnriver.com/phpBB2/...es/diamond.gif, 6http://www.flopturnriver.com/phpBB2/...iles/spade.gif (3 players)
SB checks, UTG checks, Hero bets $1.25, SB calls $1.25, UTG folds.

Turn: ($4.10) 2http://www.flopturnriver.com/phpBB2/...es/diamond.gif (2 players)
SB checks, Hero bets $2.5, SB calls $2.50.

River: ($9.10) Thttp://www.flopturnriver.com/phpBB2/...miles/club.gif (2 players)
SB checks, Hero bets $4, SB raises to $5 (All-In), Hero calls $1.

Final Pot: $19.10

Preflop there's really no need to get fancy. Most of the small stakes opponents don't know that you have a tight image, let alone what gap theory is. If you ever feel the need to play T8s, do it in late position.

Post flop looks good to me, I'd just set him all in on the river.

this looks good until the river, that $4 bet was awful. if hes calling 4 then hes calling for 5, raising anything that beats you obv. youre just throwing $1 away with this play.