Need to make bigger raise against LAG

[techballer]

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.10/$0.25
8 players
Converter (http://www.neildewhurst.com/hand-converter)

Stack sizes:
UTG: $10.75
UTG+1: $13.95
MP1: $27
MP2: $25
CO: $28.85
Button: $20.20
SB: $14.80
Hero: $20.45

Pre-flop: (8 players) Hero is BB with Q/images/graemlins/club.gif Q/images/graemlins/spade.gif
2 folds, <font color="#cc0000">MP1 raises to $0.85</font>, 4 folds, <font color="#cc0000">Hero raises to $2.65</font>, MP1 calls.

Flop: 3/images/graemlins/spade.gif K/images/graemlins/club.gif 9/images/graemlins/diamond.gif ($5.4, 2 players)
<font color="#cc0000">Hero bets $2.5</font>, MP1 calls.
<font color="blue"> Did the bet need to be bigger here, and if so how much </font>

Turn: T/images/graemlins/club.gif ($10.4, 2 players)
<font color="#cc0000">Hero bets $3</font>, <font color="#cc0000">MP1 raises to $9.5</font>, Hero folds.
Uncalled bets: $6.5 returned to MP1.
<font color="blue"> tried small bet here hoping he would call, as opposed to me checking and looking at big bet </font>

Results:
Final pot: $16.4

[techballer]

Forgot to mention here MP1 was LAG