Found myself in this spot yesterday.

Player Reads:
UTG: tight abc player but does not adjust for position. Typical older 1/2 player that likes to see lots of cheap flops and will get out of the way when not making a strong hand.
SB: tight passive player. Has not won a hand in a while but has seen a lot of flops. Gives regular tells.
BB: strong player; aware of various advanced concepts and plays a TAG game. Demonstrated that he does not adjust to individual players very well.

UTG limps for $2
HERO utg+1 raises to $12 with QQ
folds around
SB calls $12
BB calls $12
UTG calls $12

Flop ($48 less 5 rake/bbj) 983
UTG checks; HERO bets $26.
SB tanks for a while and goes back and forth between folding and calling. Eventually calls $26. BB folds. UTG calls $26 relatively quickly.
Turn ($119 pot) 8
SB checks. UTG checks. HERO ???

My opinion of this scenario is that SB is definitely on a draw, but not sure which one. UTG is likely to be on a draw too with this draw heavy board; however, with him limping first he could have a made hand or something as weak as top pair. With lots of river cards being a scare card for us (A, K, hearts, 7, maybe 5) do we press here or slow down? Note: Both villains have about 80-100 behind at this point.

With effective stacks this is a pretty straightforward shove for value OTT. Barring an off suit deuce or something, you couldn't have really asked for a better turn card. Checking turn would be very bad.

100BB effective?
Little bigger size OTF, around 35 - 40 and then it becomes easier OTT.
Now it's only push OTT as can't afford B/F here.

Sorry if with 100BB still effective on turn, I'd bet turn about 70.
Anyway flop sizing has to be bigger to stack/price FD, TP kind of hands.
OTT my default is B/F as no one will really C/R all in with FD OTT.

I think villains have $80-100 behind

What are the "regular tells" V is giving away?

I'm betting turn.

Flop I'm going 35-40.

Turn ship it.

If the flop was 9h8s3h, are you guys still shipping turn or checking behind?

We are not slowing down on the turn, to answer one of your questions

You got one of the best turn cards in the deck with the offsuit 8 pairing the board, and both players is very likely on draw or holds one pair hands that you are ahead of like for example K-9 or A-9 for top pair.

With the SPR you have on the turn this is a must bet card. The amount of scary rivercards is countless, and its incredibly hard to know wich of them missed your opponent and wich really made their hand.

Bet the turn for value and be happy to get it in is my two cents.

I suggesting betting more on the flop. ~40

I consider the 8 to be a good turn card. If both opponents have ~100, I'm quite happy to shove.

Good question. I'd obviously be a little more concerned about an 8 on the turn in that scenario, but not enough to check. Still shoving.