You played badly on the preflop. Your first bet was very good, but when you have AA and get a re-raise from a short player, you have to go all in! You have the strongest and best hand, in this situation everything is very simple! The second player paid well when he called x7! To avoid a bad option for yourself, when you see the river, the second player must be knocked out, using all in and easily get chips when he made a call after the first player and all the chips of the first! In the current situation, you should not invent problems for yourself!
I don't understand why you would wanna deny
equity with AA. Like what is gonna happen if you jam all in, basically the guy with 70BB is gonna fold, then you are playing heads up against the 20BB stack.
Raise 20BB good, because it looks like you are trying to bully the deep stack out of the pot, and you have potentially a weakish hand.
Also that way the guy calls, and if he flops a pair, he has to go with his hand, while being a huge under dog.
It's like, if you jam AA in against a flopped pair, vs let's say, a pair of jacks, your equity is about the same. You are huge favourite.
Of course somewhere around sub 10% of the time, your AA will be out flopped, but that's just the nature of the game.
Anyways, point is, I think your assessment is a bit ridiculous lol. OP got unlucky, not much you can do. Guy could easily of had a open ender or slow playing KK QQ, JJ, even 10's. Could be as loose as guy shots too. You never know, people stupid things all the time.
You gotta give them a bit of rope in my opinion. Also, you gotta give action, to get action.