first hand is ok, no way I am folding AK to 3bet.. on the flop I either b/f or c/f, since he missed with his range many times, but he can be easily holding an overpair...
second hand: limping after a 3bet with ladies? youre asking for trouble... first player is dead money, but with such a small raise, he is getting nice odds even with ATC... just raise it and dont give and dont overestimate his range...
last hand is fine with with me, pot is big enough to be taken down right away and with a bet like this, you can easily tell a set from a bluff...