Tight Hero ($300, UTG) raises to $13 with AJdd, UTG+1 ($200, weak-passive fish bleeding money) calls, SB/villain ($700) makes it $30, Hero ???

SB/villain is a very weird middle-aged player... he loves to call pf raises all the time, he bets $20 into $120 pots into 5 players with middle pairs all the way to the river when he's not the aggressor, and somehow, manages to win this way everytime.. basically, his game is transparent, when he's betting 1/5th pot, it's like scared money and he folds if raised...

The problem here is his raise is so small it's giving me sick odds to call, if he makes it even $35 I'd probably fold, but $30 AND being IN POSITION is tempting me.. because this guy also has a tendency to get crazy postflop when he has nothing.. but I'm unable to deduce what's he raising to $30 with...

If you don't have an idea what it means, with the fish behind, going to have to call and see a flop.

If you could find out it's a hand like AQ/AK 88/99/TT/JJ that would not want to play vs a 4-bet, it'd be a good spot to put in a huge re-raise. Considering the limited information we have on villain. I don't see any other play than call.

The problem is V is a gambooly player and could possibly call a $110 re-re-raise here with mid pps, AK/AQ type hands etc... He knows I'm tight but he seems to only be playing his cards

I'd let this one go. Not a fan of playing a bloated 3! pot with The AJ. You could easily be dominated (AK, AQ) or crushed (JJ, QQ), and if the flop comes low cards its tough to play. Mabe Im just a nit...

If V is as you've described I think we can know right where we are at post flop. We can read his sizing as weak or strong, assuming it is really that easy. Call.

But is preflop a fold?

Fold to preflop raise.

You're getting 3.5-1 in position, with a hand that flops really well. Call.

Easy call in cash, tournament different story. The weak fish shouldn't be your worry. See what the SB does post flop and play accordingly

I think he has a monster. The villains I play with don't tend to reraise to amounts between $35-$50 unless it's a lag. In fact, they just don't tend to reraise and almost never will without a huge pocket pair. To them, a reraise to $40 is a huge amount. This guy bets $20 into $120 pots and on this hand he reraises to $30 which is more than twice the amount you raised? His range is super strong IMO. He isn't doing this with a hand like pocket nines, AT, and even AQ or JJ.

I'd say this is an easy fold. Lots of players have bet sizing leaks and a very common one I see is not reraising big enough. To them reraising to 3 times your amount is huge. Another leak is they rarely reraise without a monster.

AJs is great when you get callers who call with a wide range. It's a very different story when you're up against a very strong range.

Why isn't villain reraising more if he has a big hand? It's because he wants action. He is afraid that he will scare you off when he has AA or KK, and even the OP admits that he would fold to a slightly bigger raise. Villain doesn't want to win a pot of less than $30 with AA or KK. If he raises bigger that's likely to happen. So villain will keep his raise just small enough to get a caller.

This makes me more convinced that villain is really strong. The read on him isn't "he likes to reraise pf raises all the time."