Does my hand have too much showdown value to do this?

[Entity]

Villain is a 28/22/2.5 TAG, capable of a fair amount of aggression postflop. I think he's capable of raising this flop at times with any pair, any draw, and complete air. FWIW, I could, and would, play KQ exactly like this the times that I dont' 3bet the flop.

Party Poker 10/20 Hold'em (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is SB with J[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises</font>, BB calls.

Flop: (4 SB) 6[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">BB raises</font>, Hero calls.

Turn: (4 BB) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, BB checks.

River: (4 BB) 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">BB bets</font>, <font color="#CC3333">Hero raises</font>...