The easiest players to play against are the ones that bet when they have it and check and call when they have a draw or a hand they will fold at some point. The players that most frequently play AA and KK passively actually have some method to their madness, and it's that they always have it when they bet, everyone knows they always have it when they bet, and so no one pays them off when they bet, so instead of bluffing and playing more hands aggressively, they just start playing their big hands passively in addition to all the trash they play passively, which protects them a little bit, and allows them to get more value than they would have gotten otherwise. This adjustment makes these players tougher to play against and slightly less exploitable.
The adjustment to make is that when someone's calling range at any point in a hand contains a higher proportion of good hands, you can't bet as often. You need to have at least a modicum of equity when you bluff flops and turns, and you can't value bet as thinly.
Another adjustment I would make is that I would make a lot of turn and river overbets with any 2p+ hands in limped pots against these players on low boards without made flushes or one liners, because they will have more overpairs than better 2p+ hands in their calling range. Like, if stacks are 300 and I had 54 on the Td5c4c flop, I bet, and one of them called, and the turn was the 9s with 30 in the pot, I would probably bet 100 and jam a lot of rivers. If you ever get caught bluffing after making a pretty big bet, some players will never fold an overpair to you, so this actually works ime, despite the fact that you're obv never bluffing in the particular spot.
