QQ should be folded to a 4 bet to a lot of players when playing 100bb FR. AK is definitely not worth going allin with pf deep stacked. There's no value in it at all. If a decent player is willing to go allin pf he has a high pair or AK. He won't have AQ. The only way you can go allin is if for some reason you're getting a lot of value or you can be very certain you're opponent has a lower pair or an unpaired hand and you're getting sufficient odds.

I've never folded KK pf - but I've never had the opportunity. The stakes I play are too low and usually I don't have stats on my opponents. Offline I don't think I've ever run into aces when i've had kings - and even if they did 99% of the time i'm playing with fish so i'm never folding.

This advice doesn't apply when playing against fish/loose weak players.
You should fold bigger hands a lot less in tournaments (but only because of the smaller stack sizes).