Honestly there is a wide margin of correct answers on this question.
A/A and K/K etc etc get beat all the time,there is nothing you can do about it.
If you always lose(which I doubt ,it is just what you remember),then there is something amatter with the way you are playing them preflop.
After the flop they are just a pair,and obv the more people in the hand the more chances of them being beat or not holding up.
My suggestion would be,
1) As always analize your opponents play and range.
2) Judge your postion and how to isolate but optimize value at the same time.
3) Determine what stage at the tournament you are in and what possiblities of losing the hand would conclude,ie how good are you on chips compared to anyone in the hand.
4) I personally always will put heavy pressure on my opponents pre flop with power
hands like this,especially in early postion,qhere im hoping for A three bet or four bet shove from an aggressive high chip stack.
If I lose I lose but most often always try to get my chips in the middle.
After the flop like you mentioned if board comes say 5/6/7 all hearts etc ,then what do you do hmmmm. choice is yours from there on,personally I would again refer to 1) analize your opponents play style and range and your postion,from there on you can judge your own hand.
But the important art is to not let them push those power hands around even after the flop if your opponents range does not match the board,then put them to the test and show strength.
Showing weakness or scared money is not the way to handle it.