88 flops set and gets action

[BigBrother]

MP1 is very loose, somewhat aggro preflop, passive postflop. MP3 is fairly loose passive preflop, pretty aggressive postflop, but these reads are only for 30-50 hands.

Party Poker 2/4 Hold'em (9 handed) FTR converter on zerodivide.cx

Preflop: Hero is UTG+1 with 8[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, Hero calls, <font color="#CC3333">MP1 raises</font>, <font color="#666666">1 fold</font>, MP3 calls, <font color="#666666">4 folds</font>, Hero calls.

Flop: (7.50 SB) J[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP1 bets</font>, <font color="#CC3333">MP3 raises</font>, Hero calls, MP1 calls.

Turn: (6.75 BB) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, MP1 checks, <font color="#CC3333">MP3 bets</font>, <font color="#CC3333">Hero raises</font>, MP1 calls, <font color="#CC3333">MP3 3-bets</font>, <font color="#CC3333">Hero caps</font>, MP1 calls, MP3 calls.

River: (18.75 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>...

Final Pot: 24.75 BB


1) Am I losing too much value slowplaying this flop? I am looking to jam a non-heart turn.

2) Turn c/r looks like a given.

3) What's my plan for this river?