Lossing at O8 limit, I think I'm too tight, too passive

I've been winning at limit hold'em and worked my way up to 3/6, I'm at about 2BB/100 after 150k hands.

I was reading about players making 6BB/100 at O8. So, I recently started to give the micros a try at O8 and after 4k hands I'm beginning to suspect I'm a losser (although I realize 4K is not that big of a sample).

4K hands VPIP 21%, W$WSF% 22% -2 BB/100 (rake 2.1 BB/100 in my defense lol)

It appears I'm not winning enough pots, I think it's because I'm folding too much and to a lesser extent I'm playing to passive.

Here's a hand that I thought was borderline, wanted to fold, but fighting that urge, I bet the flop for information, didn't get any and then call down.

Paradise Poker 0.50/1 Omaha/8 (8 handed) pokerhand.org hand converter

Preflop: Hero is UTG with A[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/heart.gif[/img].
Hero calls, UTG+1 calls, <font color="#666666">2 folds</font>, CO calls, Button calls, SB completes, BB checks.

Flop: (6 SB) 7[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, UTG+1 calls, CO calls, Button calls, SB folds, BB calls.

Turn: (5.50 BB) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, Hero checks, <font color="#CC3333">UTG+1 bets</font>, CO calls, Button calls, BB calls, Hero calls.

River: (10.50 BB) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, Hero checks, <font color="#CC3333">UTG+1 bets</font>, <font color="#CC3333">CO raises</font>, Button folds, BB folds, Hero calls, UTG+1 calls.

Final Pot: 16.50 BB