$1/$3 Line Checks after 2.5 yrs of only PLO

Coming back to live hold'em for a 2025 prop bet after 2.5 years of playing thousands of hours of live PLO. Posting here to get berated into getting back in shape. In every spot, we are 9-handed, and you can assume the position folded if I don't mention it preflop.

1)
UTG $15
UTG+1 (HERO) $45 w/ AcQs
BU ($725, the effective stack) cold calls
UTG calls
Pot: $139
Flop J86 one club
UTG checks
UTG+1 bets $50
BU calls
UTG folds
Pot: $239
Turn J86c 4c
Hero checks
BU bets $125
Hero folds
Should we lead for $50 3 way on flop?
In hindsight maybe I can check because I dont have as many nutted hands on this dynamic board (sets) as villain when I 3b. JJ of course but my opponents have all the 66 88 and JJ that elects to cold call instead of 4b. I don't this player has any 57 combos when cold calling but I couldn't find an A high call here on turn. Also have Ac blocking a AXcc combo he could've cold called with.

2)
In another hand I 3b UTG+1 w/ AQo from LJ. UTG+1 is probably raising optimally - pretty tight. Is this 3b just a slam dunk?

3)
UTG+1 call $3
CO call $3
SB (Hero, $575 effective) with KJcc raise $20
UTG+1 call
CO call
Flop 4QJchh
UTG+1 checks
CO (fun player) overbets ~1.5x $95
SB folds
UTG+1 folds
Just a laydown on this flop I think vs. villain. In general I don't think the population is overbet bluffing flops. Big 3b sizing ok in SB?

4)
$6 BU straddle. SB limp, BB limp (action starts in the blinds in Texas if there's a BU straddle). Limps all the way around to HJ (Hero) with QJss - fold? Smallest stack of the limpers so far is UTG+1 with about $240 behind. Thought I had 0 fold equity and a huge size would be a mistake with no folds and people still behind

Thanks for taking the time to respond, and I'm hoping you have a great 2025!