I like calling in your given scenario. I'm a big believer in mixing up your play ie. I think it's wrong to never slow play AA. Never is usually a bad word when formulating poker strategy.

I sometimes even open limp with AA but almost always this would be UTG in level 1 or 2.

There's risk/reward with every decision. Sure you sometimes get busted slowplaying aces but that doesn't mean it should never be done. Many times I have raised with AA only to have everyone fold that doesn't mean I should never raise with AA right? I guess what I'm trying to say is people who always play certain holdings the same way are not playing optimally IMO.