Flop bottom set - slow down?

[Tiburon]

MP1 is 63/4/0.32 over 50 hands. SB is 20/9/1.42 over 375 hands. I wasn't sure what SB had, but I didn't think he could have me beat. I put MP1 on KQ from the start and stuck with that read to the end. Should I have gone into calldown mode anywhere?

Prima Poker skin
Limit Holdem Ring game
Limit: $0.50/$1
10 players
Converter

Pre-flop: (10 players) Hero is BB with 3[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/club.gif[/img]
2 folds, UTG+2 calls, MP1 calls, 3 folds, Button calls, SB calls, Hero checks.

Flop: K[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/spade.gif[/img] (5SB, 5 players)
<font color="#cc0000">SB bets</font>, <font color="#cc0000">Hero raises</font>, UTG+2 folds, <font color="#cc0000">MP1 3-bets</font>, Button folds, <font color="#cc0000">SB caps</font>, Hero calls, MP1 calls.

Turn: J[img]/images/graemlins/diamond.gif[/img] (8.5BB, 3 players)
<font color="#cc0000">SB bets</font>, <font color="#cc0000">Hero raises</font>, <font color="#cc0000">MP1 3-bets</font>, <font color="#cc0000">SB caps</font>, Hero calls, MP1 calls.

River: 4[img]/images/graemlins/spade.gif[/img] (20.5BB, 3 players)
SB checks, <font color="#cc0000">Hero bets</font>, <font color="#cc0000">MP1 raises</font>, SB folds, <font color="#cc0000">Hero 3-bets</font>, <font color="#cc0000">MP1 caps</font>, Hero calls.

Results:
Final pot: 28.5BB