Nice topic. I almost always use two small corkies instead of a single larger one. My little secret is to use one glow and one nonglow.
I combine pearl pink w/pinkglow, peach glow w/orange, old style white glow w/pearl pink dot, etc. Bit of white yarnin between to hold scent.
BTW I'm still fishing about 50% old style cork corkies....the new foam ones offer a lot more color options but I don't like the way they float higher than the corks.

Gooose