I disagree with the "changing it up" philosophy. I look at the opponents that are hard for me to read, and they are not the ones who bet the "maybe" hands like early AK weak and the monsters big. They're the ones who raise 2 or 3 times the big blind, consistently, on any unraised pot they enter. If you don't raise or weak raise your early AK and you get callers and limpers, you have no idea what kind of strength you're up against. Also, it's a good hand but not a great hand; the more people you allow to the flop, the bigger your chance of getting beaten, even if one of your cards hits. Hillbilly is right. Make the K6 fold preflop. Why in the world wouldn't you?
Not that Dick is wrong. You certainly do consider table dynamics and make adjustments.
Play your AK strong. That way, subsequent bets - even if you're bluffing - demand more respect.
If you insist on slowplaying your big hands, please come to my table.
The exception to this might be in a tourney situation with a medium stack. You don't want to get sucked down a blackhole, so maybe you'll try to limp and see how the hand develops. But short-stacked: all in. Big stack: play strong but leave yourself an out. Cash game: don't jump on the slowplay bandwagon.
ANOTHER reason not to slowplay is that big hands want big pots. You limp with your AK, get a good flop, make a bet and . . . everybody folds. Part of the art of poker has to do with building a pot. If you have a hand with good potential, you're going to want to take some steps to build the pot. get some money in there, bet the pot post-flop (which should be a big bet) and you've made a worthwhile profit.
It really does concern me when I read posts like yours where people promote slowplaying as good strategy. Sure you're welcome to do it, but as a developing player, you really need to be aware of your motivations, aware of the consequences, and aware of going down blind alleys. We're all here to help each other; which kind of goes against my grain, because I'd much rather have weak opponents. But since you asked earnestly, please consider the advice.
Now if you flop a FH, sure . . . Go ahead and slowplay.