Ancient Logic

I've run into a problem. My current story's conflict doesn't quite have the punch I want it to. I've tried a few different methods to figure out what exactly is troubling the main character or what larger issues are in play, but I'm not there yet. While my story stews for awhile, I thought I'd talk about my dissatisfaction with the standard model of literary conflicts. In other words, let's talk shop. Usually in literature we say conflict comes in four basic types: man versus nature, man versus man, man versus society and man versus self. This is the model I heard in school and this is the model I teach in my own literature class. You could throw in a few other types of conflicts, depending on the genre, conflict versus supernatural beings or conflict with technology. You might even subtract one of the categories due to ideological preference (Ayn Rand disliked the idea that nature had any choice in a story, big surprise). But for the most part...