Level Design Creep is what I've started to call what happens when you build a series of levels and notice that every level is a little bit better looking or designed than the last, or when working together with several people with different skill levels. Left alone, as the player goes through the game the level quality would go up and down according to the order the levels were built. It seems like we're spending more time on this than we should be.
Besides cutting out the really good and really bad levels, is there a way I can plan for or manage the production so that the detail doesn't "creep up," and we have to revisit the same work over and over?