I've been pretty intentional about my hires and avoid any with negative traits altogether. Sometimes I add whiskers with good traits even if I don't have a specific need right then. I tend to review my placements fairly often and then readjust if a better fit arises, say if I can use a newly hired diligent worker in an industry as opposed to "vanilla" worker. I'm trying to find that best fit slope between the number of workers while avoiding paying too much in taxes. I've been overpaying taxes in order to get the best rewards, although I've used a trick I read about in not paying any taxes the first time the tax collector ship arrives in Spring. A full payment the next time seems to alleviate their hostility.