Raising to isolate. Good move or not??

[toddw8]

My thoughts in italics

PokerStars 0.05/0.10 Hold'em (8 handed) converter

Preflop: Hero is Button with 9[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/club.gif[/img].
<font color="666666">3 folds</font>, MP2 calls, <font color="CC3333">CO raises</font>, <font color="CC3333">Hero 3-bets</font>, <font color="666666">2 folds</font>, MP2 folds, CO calls.

The raise from CO could mean any number of things. I'll 3bet and try to get heads up against him. If an overcard hits on the flop, I'm ready to bail.

Flop: (8.40 SB) 3[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="blue">(2 players)</font>
<font color="CC3333">CO bets</font>, <font color="CC3333">Hero raises</font>, CO calls.

Excellent flop for me combined with the fact that he didn't cap pre-flop means I'm most likely ahead. I better get some money into this pot.

Turn: (6.20 BB) 6[img]/images/graemlins/diamond.gif[/img] <font color="blue">(2 players)</font>
<font color="CC3333">CO bets</font>, <font color="CC3333">Hero raises</font>, CO calls.

The 3rd diamond isn't the best card for me, but it's low. I'm not too worried yet.

River: (10.20 BB) J[img]/images/graemlins/club.gif[/img] <font color="blue">(2 players)</font>
CO checks, <font color="CC3333">Hero bets</font>, CO calls.

There's the dreaded overcard, but he didn't seem to like it. I better get one more bet out of him.

Final Pot: 12.20 BB

Results in white below: <font color="white">
CO shows Kc Kd (one pair, kings).
Hero shows 9s 9c (one pair, nines).
Outcome: CO wins 12.20 BB. </font>

Two questions:
1. Is the pf 3bet okay here? I'm pretty sure I shouldn't fold this, but coldcalling doesn't really look like a good idea either. So I kinda re-raised out of default.

2. Should I continue being the aggressor throughout the hand, or should I have just called him down at some point?