5/10, top trips, top kicker. 3bet?

[paperboyNC]

UTG is 19/11/3.50 after 107 hands. His river aggression is only 1.50 though.

Absolute 5/10 Texas Hold 'em <font color="blue">(9 max, 8 handed)</font>

Pre-flop: Hero is UTG+1 with A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/heart.gif[/img]
<font color="red">UTG raises</font>, <font color="red">Hero 3-bets</font>, <font color="gray">6 folds</font>.

Flop: (7.6 SB) K[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img] <font color="blue">(2 players)</font>
UTG checks, <font color="red">Hero bets</font>, UTG calls.

Turn: (4.8 BB) 3[img]/images/graemlins/spade.gif[/img] <font color="blue">(2 players)</font>
UTG checks, <font color="red">Hero bets</font>, UTG calls.

River: (6.8 BB) 9[img]/images/graemlins/heart.gif[/img] <font color="blue">(2 players)</font>
UTG checks, <font color="red">Hero bets</font>, <font color="red">UTG raises</font>, Hero?

If I 3bet, he will fold a pure bluff, call with a lot of worse hands and cap with anything that beats me, plus some kings with bad kickers. Is 3betting +EV here? It seems I'll see 9[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/club.gif[/img] a lot here.