Right at the start of mtt's I've found an open shove is definately NOT the max+EV way of playing your Aces but it is the best way of achieving max+EV from hands like KK and QQ for the following reasons.
With the rockets, unless you've a large number of donks on your table who really will call any shove, i've found 3bet to around 1/3 of the average stack of the donk you wish to keep in the hand, or open to around 1/4 of table average stacks(regardless of how many bb's this is).
I've found opening to 3 or 4 bb's or limping on a loose table encourages too many flat calls and subsequent limps and is fatal to your chances of winning regularly with your AA.
This overbet will regularly get you a flat call with hands such as suited picture cards and mid/small pairs and Ace rags, where they would much more often fold to a pf shove, but, more profitably, it encourages shoves from other players too with mid/high pairs and hands such as AK and AQ where the better player realises a flat call would be poor play. Works well when the table is very loose and even the nits are pushing with 99etc.
The beauty of this pf overbet is you're always a massive favourite post flop(on average) and get to increase your stack by 25%+ if the donk folds to your c/bet and generally get the rest of their chips if they catch something of the flop.
The bloated pot also encourages the average donk to have a stab at the pot on the flop, especially when acting 1st. I personally tend to heavily donk bet when out of position to avoid the risk of a free draw with a gut buster or other hand that would only give any more action when you were beat.
Anyway, over 2000 mtt's this has consistently produced a better EV with Aces than when i experimented with shoves(over 500 mtt's) where my EV with aces was nearly half what it is now.
Kings and queens was a different matter. Not gonna go into great detail on these , but playing them like i play the aces ends up with you being much more unsure as to whether you're ahead on the flop, leading you to more awkward decisions when there's the dreaded Ace or a very wet flop. Generally ends up with less EV than when i just shove with these.
Hope my comments help and would appreciate feedback
Muttley66