your AK question, if you raise it up pre, and get 3+ callers and whiff completely, just check fold. continuation betting into 3 players with essentially air is not smart. i don't know if you have read the stuff on here about continuation bets, but against 2 or especially just 1 opponent on the flop when you were the preflop raiser, c-betting with air can be very profitable. if you don't know much about c-betting, do a search and look at some of the (many) posts on the topic. (don't just start betting at every flop if you raised pre)

as for the AA hands, id strongly recommend at least a raise of 3.5xBB +1 for each limper to get more money in when you have an equity edge and to cut down their implied pot odds. in both hands, id again prefer bigger bets on the flop, something like 4/5ths of the pot. as you saw yourself in hand 1, you got to the river with a lot of money behind, and its very hard to get someone to commit there stack when you have to bet 3 times the size of the pot. but, if you raised it to .22 pre, then bet 4/5ths pot on the flop, followed by 3/4ths of the pot on the turn, the pot is significantly larger by the river and a bigger bet isnt so unreasonable for them to call (although a 2xpot shove probably still wont get called by much, but you wont be playing 200bb deep everyhand either).

hand 2, more of the same advice, raise it to at LEAST .18 pre. bigger bets on flop and turn. chances are he still calls you and sucks out, but at least you force him to make a bigger mistake by calling. and if the pot is significantly bigger, the river decision will be more trivial.