1. It could be that they're just not eating it all the way, have you tried a different color?
2. Could be the setup. I personally have a great hookup & landing ratio on a 7'-7'2" MH with straight 15lb CXX. I've landed many 5+lb bass with this setup, even ripping it out of grass.
3. Could be the hookset. I often set the hook too quick and take it away from them. The copoly helps with this, but it's also a technique thing. Basically, once you feel it stop chattering or feel an obvious bite, reel down and sweep set hard.