I'm a firm believer in big baits for big bass. When I'm actually targeting bass I'm thinking at least 3# and hoping for 5#+. 80% of my bass flies are tied on various 1/0 hooks. I use a 6 and 8 wt rod for these - not so much for casting but it takes that for me to get the hook set. And the waters I fish have lots of wood. Sometimes you have to put some pressure on a fish to land her. A lot of my Stealth Bombers and Dahlberg Divers will have 6" "tails".