If it's the kind of tables where people want to see a flop, but not play if they miss, then raise more, more often. 4xbb + 1bb for each limper before you works quite well. C-bet more as well. Raise more often and c-bet more, and eventually they'll start playing back at you. Then change gears.

Raising with strong hands and calling with mediocre hands is probably not the way to do it. Start thinking more about the strength of the hand relative to your position. KJo isn't such a strong hand and good for folding in EP, but if you are in late position and there is only one limper, then raise it up. Only limp if there's a really good reason to do so, like it's a drawing hand and there are enough limpers to give you OK odds, or you think you'll be paid off if you hit a monster. Your first options should always be to raise or fold.

Of course hands you play and positions you play them are style and table dependent, but why would you ever want to call with KJo?