KK giving me fits

[2+2 Junkie]

Here are two KK hands that I really didn't know what to do on:

Hand 1:
CO is semi-loose, passive

PokerStars 0.25/0.50 Hold'em (9 handed) FTR converter on zerodivide.cx

Preflop: Hero is UTG+1 with K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/heart.gif[/img]. MP3 posts a blind of $0.25. CO posts a blind of $0.35.
UTG calls, <font color="#CC3333">Hero raises</font>, <font color="#666666">2 folds</font>, MP3 (poster) calls, CO (poster) calls, Button calls, <font color="#666666">2 folds</font>, UTG calls.

Flop: (11.80 SB) 5[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
UTG checks, <font color="#CC3333">Hero bets</font>, MP3 calls, <font color="#CC3333">CO raises</font>, Button folds, UTG calls, Hero calls, MP3 calls.

Turn: (9.90 BB) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
UTG checks, Hero checks, MP3 checks, CO checks.

River: (9.90 BB) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
UTG checks, Hero checks, MP3 checks, <font color="#CC3333">CO bets</font>, UTG folds, Hero calls, MP3 folds.

Final Pot: 11.90 BB

Hand 2:
MP2 is tight passive
MP3 is semi-loose passive

PokerStars 0.25/0.50 Hold'em (9 handed) converter

Preflop: Hero is BB with K[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#666666">3 folds</font>, MP2 calls, <font color="#CC3333">MP3 raises</font>, CO calls, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero 3-bets</font>, MP2 folds, <font color="#CC3333">MP3 caps</font>, CO calls, Hero calls.

Flop: (13.40 SB) 4[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP3 bets</font>, CO calls, <font color="#CC3333">Hero raises</font>, MP3 calls, CO calls.

Turn: (9.70 BB) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, MP3 calls, <font color="#CC3333">CO raises</font>, Hero calls, MP3 calls.

River: (15.70 BB) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, MP3 checks, <font color="red">CO Bets </font>, Hero calls, MP3 calls.

Final Pot: 15.70 BB