NL10 - 88 as an overpair after UTG min-raise

[Yorkshire Pud]

I've just made the return back to full ring and this hand troubled me a little. Villain's min-raise UTG could be anything but I've not seen him make it before, he seems to raise 3-5xBB each time.

Is my raise on the flop correct? With 3 villains to contend with I want to take the pot right away and if UTG does have a monster I want to find out now and get out relatively cheaply. The fact he didn't push and left himself $4 behind made me think AA or KK.

Thoughts?

Full Tilt Poker - No Limit Hold'em Cash Game - $0.05/$0.10 Blinds - 7 Players - (LegoPoker HH Converter)

SB: $10.70
BB: $14.30
UTG: $9.95
<font color="black">Hero (UTG+1): $10.85</font>
MP: $13.65
CO: $10.10
BTN: $10.45

<font color="black">Reads: </font><font color="blue">Villain running at 36/26/3 from only 30 hands. I\'m running at 19/10/6</font>

<font color="black">Preflop:</font> Hero is dealt 8[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/heart.gif[/img] (7 Players)
<font color="red">UTG raises to $0.20</font>, Hero calls $0.20, 3 folds, SB calls $0.15, BB calls $0.10

<font color="black">Flop:</font> ($0.80) 7[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img] (4 Players)
SB checks, BB checks, <font color="red">UTG bets $0.50</font>, <font color="red">Hero raises to $1.50</font>, 2 folds, <font color="red">UTG raises to $5.00</font>, Hero ????