I'm also a big advocate of 10" worms. Berkley Power Worm 10" in Motor Oil w/ red flake and Blue w/ Black flake or Yum Ribbontail 10" Tequila Sunrise and pumpkin pepper w/ green flake. I also like Culprit's 10" worm, but Yum's are my favorite. Quite honestly, I never throw out anything shorter (or longer) than a 10" worm unless it is a Senko. I've also never had problem catching smaller bass, I've caught quite a few bass that were just as big as the worm, however, it does seem like I catch a lot bigger ones too.