As far as the KK hand, your trying to get a bet from a hand worse than yours, all the while not allowing an A to get money in hte pot. You want to see a cheap showdown vs Ax hands and get paid by anything that folds to your bet, by letting them stab at the pot.

On the KKK hand, you need to build the pot to match your monster flop. Almost any bet says I have the K and most people will try to get to showdown cheaply, like your KK hand in the previous example. Your job is to bet, because a K wouldn't bet and fold out worse hands so you may be bluffing. Many hands will call a bet or even 2 on this board if you are aggressive enough on plenty of other hands thinking you may still just be trying to take it away from them. Slow playing and coming alive at the end is just too obvious.