2nd nut straight + LP providing dead money. Do i keep jamming the pot?

[neurotiq]

MP1 has only just sat at the table and I don't have any stats or reads.

HJ is very loose and aggressive preflop but very passive postflop. really a total fish: 79/19/0.71. HJ also just posted small and big blind after sitting out several hands.

I'm UTG with A[img]/images/graemlins/club.gif[/img]J[img]/images/graemlins/club.gif[/img]. Of course, I raise. MP1 cold calls. MP3 calls. Button cold calls. Both blinds fold.

Flop: 7[img]/images/graemlins/spade.gif[/img]8[img]/images/graemlins/spade.gif[/img]9[img]/images/graemlins/heart.gif[/img]

It checks through.

Turn: 7[img]/images/graemlins/spade.gif[/img]8[img]/images/graemlins/spade.gif[/img]9[img]/images/graemlins/heart.gif[/img]T[img]/images/graemlins/heart.gif[/img]

I bet. MP1 raises. HJ cold calls. Button bails. I 3bet (for value and to charge any lingering flush draws). MP1 caps. HJ calls the two bets coming back at it. I call as well.

River: 7[img]/images/graemlins/spade.gif[/img]8[img]/images/graemlins/spade.gif[/img]9[img]/images/graemlins/heart.gif[/img]T[img]/images/graemlins/heart.gif[/img]2[img]/images/graemlins/club.gif[/img]

The previous round's cap is starting to make me fear the bigger straight.

I check. MP1 bets. HJ calls. I call.

If this were heads up, I'd feel a lot better about my c/c since I feel like, at best, I'm probably only chopping. Since HJ seems to be providing dead money, though, should I be looking to jam the pot again?