JC - Trading around a core is always a good idea in a stock like KRY. But it is best done when you take those shares you plan to trade out of your "this is part of my core" mindset. You have to treat them like two separate entities or you will go mad trading one while looking at the other. This will be especially true if your trading shares happen to be out when the permit comes.
As far as strategy goes, I change mine almost daily and it depends on what I see in the market, the sector and in how she is behaving right now. Kind of like how you treat a wife. When she is in a bad mood, you go with a soft touch, when she is frisky....well you get the picture.
KRY also follows her own whims more often then not. The usual pattern is up in the morning, with a steady decline hugging the lows of the day all day and closing down, but up from the lows in the last minutes. Lately that means selling in the morning and buying during lunch hour, but you have to be quick, and often that decline continues and accelerates up until just before the close. That pattern is risky.
When KRY comes off her lows and trades around the middle of the range, she is usually feeling a little more frisky and an afternoon rise often follows.
All this said, these days trading KRY is a tough challenge. Days like today, investors are taking money out of spec stocks and playing the bigger stocks that are almost guarenteed to rise with good news like this morning. More often than not it has become a "feeling" about movement for the day that has dicated my trade entries and exits.
I'm off to Mexico so I will be a non-trading core holding long until next week, unless I can get some computer time.