Lots of good stuff in this thread. Have to echo the comment about using small poppers for bluegills -- they tend to nip so if the popper has any size to it, any hookup is mostly accidental. My favourite bluegill rod is quite soft so the hookset consequently, is slow and lazy. Give them time to turn with it and most often, they hook themselves. They can't suck it down with the force of a bass, but if they seriously want it, they usually don't miss.
If you're hearing a lot of "tick", "tick" on the retrieve, then the 'gills are nipping at your popper but they can't inhale it -- it's usually a sign to go much smaller. My bluegill poppers are about 1/4" across the body.