A denser wood striker helps make it easier to kee kee. A couple very important things is to make sure you keep the angle of your striker exactly the same all the way through your motions, if it changes any at all the call will start to break over like a yelp. Secondly you have to kill as much of the vibration as you can in the striker, spread your fingers out a little and pinch it tight. Just run a straight line through the area where you normaly play your calls, the more the call is played the easier it is to kee kee on.
To run a kee kee run, as you finish your last kee kee release the preasure on your striker and snap it straight down into the call, just like you do on a yelp.