floating the semi-bluff check/raise

[bbbushu]

UB $1/$2 6 max 5/6

CO is like a weak-tight TAG; s/he seems to think about the hand, etc. but has backed down easily without a very strong hand so far. this isn't much of a read, i know, but i'm really more looking for thoughts on this kind of move, in the first place. i'll admit i'm posting this hand because i've started doing this a little bit lately (almost unintentionally) and i'm not sure about its merit or if i'm just turning into a LAG.

Chun li is BB K[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/diamond.gif[/img]

Pre-flop:
one fold, CO calls, two folds, <font color="green">Chun li checks</font>

(2.5 small bets)

Flop:
2[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/club.gif[/img]

<font color="green">Chun li checks</font>, CO bets, <font color="green">Chun li calls</font>

(2.25 small bets)

Turn:
5[img]/images/graemlins/club.gif[/img]

<font color="green">Chun li checks</font>, CO bets, <font color="green">Chun li raises</font>

thanks,
bbbushu