SB is 58/16/ (3agg postflop) over 200 hands

Ok so I have been working on my play lately and am trying to work out when to use "free showdown technique". I am guessing this was right, but after he didn't 3-bet the turn maybe I should have bet/folded this. What does he call if I bet though? He is seriously loose so do we see A-x here enough for bet/fold to be the correct play?

Could he have gotten tricky with a 3, or got scared with his K, or would he bluff raise due to high aggression? These all make me think betting may not be correct.

Is it better to call down after he fires again, or is the free showdown play what we want because we are probably ahead and we want to charge him to draw? If we get 3-bet we are folding and lose our 2 outs to improve. I thought that we are probably ahead often enough to raise here and hope he doesn't improve, he may check/fold river when he doesn't improve so we lose a BB. However he may often check when he does improve because of the aggreession we have shown?

Prima 1/2
Hero is dealt T [img]/images/graemlins/heart.gif[/img] 9 [img]/images/graemlins/heart.gif[/img]

Preflop
All fold to Button who limps, SB completes, Hero checks.

Flop :
K [img]/images/graemlins/club.gif[/img] 9 [img]/images/graemlins/diamond.gif[/img] 3 [img]/images/graemlins/spade.gif[/img]
SB bets, Hero raises, Button folds, SB calls.

Turn 3 [img]/images/graemlins/club.gif[/img]
SB bets, Hero raises, SB calls.

River 8 [img]/images/graemlins/diamond.gif[/img]
SB checks, Hero checks.

True