Quote of the day from Blizzard about tweaking Starcraft 2: Heart of the Swarm. I have the same sentiments with the personal project I'm writing. Content is done. Pacing is good. But there are still a few loose ends to tweak, and they're as hard as hell.
Sometimes I wonder if God (or the random cosmic beings that created us) had the same problem when he (or they or it) created our sick and twisted minds. I guess we'll never know.