Villain 1 is a recreational player, he reads hands, plays too many of them preflop but could probably grind out a small winrate if he folded more hands pre. Has played with me plenty, and has joked that "You [I] know what you're doing, this isn't your first rodeo"

Villain 2 is ridiculously loose, loves seeing flops, isn't a total drooler (ie, I've seen him raise/fold the river with trips vs obvious boat) but loses plenty of money in the game.

Hero has mostly been playing tight and getting respect - earlier, aggro fish lead out Q75r half pot, tight PFR flatted, we 4x'd with 76s and both folded, tight PFR showed a Q and said he has to give me respect. Hero also just tank tank TANK called a jam with Q6s / trip queens on the river for a half pot jam, vs a tight player.

Stacks are $1000 effective

Villain 1 opens UTG to $20, we're in the HJ with KJ and make it $65, villain 2 flats cold from the SB, villain 1 calls.

I don't normally 3bet this hand, but there hadn't been much 3betting at the table and I felt like I could take it down some % of the time pre, plus I hadn't 3bet at all and we were already several hours into the session.

Flop: A74 ($170)
Checks to me, I bet $45, villain 1 calls, V2 folds

I'm pretty much range betting $45 here, especially with V2 in the hand who can have all sorts of random trash he'll fold. Planning on barreling some turns, with the K and J blockers to good top pair hands.

Turn: 3 ($260)
Villain checks, we check back

If we want to barrel this card, I think we need to do 2 barrels, plus if I did have a decent but not great ace, like AJs, I'm not gonna barrel here, I'm gonna do it on the river

River: 2 ($260)
Villain checks, we bet $145...

would be my bet sizing with an ace, but not sure if I should be betting more like $190-340 here, as I think the 4 liner on the board should get me some respect. Could also just check, but I don't expect him to call with a non ace pair, and he should have 88-QQ, AJ+ mostly with this action, which is 27 folding combos and 30 top pair combos, so a 1/2 pot bet should print money unless he finds a lot of hero calls or I'm wrong about his range.

I like your line and I think it will elicit folds out of this player type often enough. I don't see a need to go bigger than half pot and I don't mind even going smaller for like $80-$100. He's not folding his better Ax which he still has in range (AQs, AJs, ATs at a minimum without knowing the player myself). I think 1/2 pot is about right since you might bluff him off the weaker Ax holdings. It also allows you to remain somewhat balanced when you take this very reasonable line with value. NH.

Seems to me you're properly repping AJ or A10 suited given the action as described. Agree in principle with your ranging of the main villain - but would add that I wouldn't be shocked to see that player-type getting frisky preflop with weak suited aces... even just a few combos of those upsets your math... Doubt he checks aces-up on the river, but I would expect him to call river some of the time with a weak ace...occasionally I might bluff catch with JJ-QQ against this line as well.

You'll probably get all non-ace pairs to fold, so it a good line with this hand. Unfortunately, you're going to have to play AK the same way to massively value cut yourself. Otherwise, someone in your game is going to figure out how to tell whether you have TP or not.

I mean, they'll have to keep track of how I play my hands across hundreds of hours to get anything close to a reasonable sample, and given that my play constantly changes, that feels rather unlikely to me. In this hand, if we get a different turn, like a 2 instead of a 3, I continue to bet the turn in this hand - most villain will miss the difference between a 2 and a 3 on the turn

Plus, I 3bet a lot of low garbage, which means I don't just have AK/AQ here, but also 45s, A5s, A2s, and 57s (not 56 cause that bets the turn)

Is V1 likely to peel a small c-bet OOP in a 3-bet pot without an A?

I think a lot of people would put you on JJ-KK and act accordingly. Only the ones that think a bit would include AT-AQ.

Preflop: Call. I'd save the 3bets with KJs against UTG raisers for players I could more easily move off of hands, either immediately or later in the pot, and I'd definitely not make this 3bet with a "ridiculously loose" player left to act.

Flop: As played, I suppose betting tiny is justifiable if you've been making tiny continuation bets all session, but against very loose opponents there's no reason to be making tiny continuation bets. You can better take advantage of their leak by betting 2/3 or larger when you c-bet.

As for the specific hand, bet $110ish unless your opponents are so loose that you think you have no chance of taking it down now.

Turn: As played, a check is good.

River: As played, check. If your opponent reads hands decently and leans to looseness he'll realize that after showing weakness with a tiny flop bet and a turn check, a large bet from you on the river represents a bluff. I would expect him to call with any A, pocket pairs 88+ and maybe even a 7. Since the only flop draw got there, that's basically his whole range that he's likely to call with.

Just my opinion...

+1