On hand 1: I like your thought process and would do the same thing, that is, isolate the short stack against my A-K. I really don't like pushing though. You're only going to get called by someone with a big hand, and I don't want to risk all of my money with A-K. But most importantly, I think reraising to something like $130-150 would have the same effect. No one's calling that kind of raise unless they have a real big hand, and if anyone comes over the top of that and pushes in, well you're probably beat. But I think that has the effect of isolating without having to put all your money in preflop with A-K.

Hand 3: Without a read, I have to fold. If you know he's capable of playing A-Q this way, then call. But you have to have a read that he's able to way over play top pair to call for your whole stack with just an overpair.