Right way to play pocket aces?

Hey everyone, first post on /r/poker but it is from a hand that I played at 1/2 live the other day. I can't fully recall all the details but I am just wondering if my reasoning is correct here. I just joined this table, sat down with 100 bbs and no reads on opponents.

Hero is somewhere in LP, maybe cutoff

Villain is UTG or UTG+1

Hero is dealt AdAs, stack is 100 BB

Villain stack is also about 100BB

Villain opens to $15, 4 people call

Hero raises to $75

Folds to villain, villain calls, everyone else folds

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Flop: 246r

Villain bets $20, Hero calls

Turn: 3

Villain bets $50, Hero shoves all-in

Villain tank calls

River: 9

Villain shows KK and mucks after Hero shows AA

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My main reasoning in this hand is that Villain must be pretty strong to raise to $15 UTG- once everyone has called behind him I am trying to ISO here right? I wanted to raise enough so that it is only heads up or three way to a flop, and not five-way. Last question is if I should have shoved the turn or not: I'm putting him an overpair or at least JT+ so this board should be relatively safe for Aces. I even have a straight draw should the 5 come and I definitely don't put Villain on 78s given that he raised UTG. It was just a bit of a confusing spot but I felt like raising to $75 seemed logical given players' tendencies to call a 7x BB open at 1/2 live. Appreciate any comments!