Pocket Rockets w/ a Flop to Cause Headaches

I've been trying to clear the bonus at bet365.com, so this is a 1/2 game. I've never played higher than .5/1 before, and, while my bankroll is big enough to handle it, I'm not certain how my play is going to stand up. The players are shockingly tight at this limit, as in 23-25% see flop (if the bonus wasn't quality, i'd definitely leave). I actually had four villains fold to a semi-bluff donkbet from the big blind once. . . but I digress.

EDIT to add: I haven't seen the two villains in this situation play a single hand to this point, so I know that they are very tight pre-flop, and that's about it.

Bet365.com 1/2 limit Hold 'em
Hero is button with A [img]/images/graemlins/spade.gif[/img] A [img]/images/graemlins/club.gif[/img].

1 fold, UTG+1 calls, 3 folds, MP3 calls, 1 fold, Hero raises, 2 folds, UTG+1 calls, MP3 calls.

Flop (3 hands, 6 small bets): Q [img]/images/graemlins/heart.gif[/img] 9 [img]/images/graemlins/heart.gif[/img] J [img]/images/graemlins/diamond.gif[/img]
UTG+1 checks, MP3 checks, Hero bets, UTG+1 calls, MP3 raises, Hero calls, UTG+1 3-bets, MP3 caps, Hero calls (and curses at his computer).

Turn (3 hands, 9 big bets): 8 [img]/images/graemlins/spade.gif[/img]
UTG+1 checks, MP3 bets, Hero calls, UTG+1 calls.

River (3 hands, 12 big bets): A [img]/images/graemlins/heart.gif[/img]
UTG+1 checks, MP3 checks, Hero???