Are you doing anything to nurture these two extremes? Or do they just come naturally to you?

Your comment reminds me of a discussion I had with my cofounder long time ago (yes I have tried the startup path multiple times). We were discussing how this pattern of wildness, of strong desire to produce things follows an almost relaxing, reflecting period. The discussion arose while we were learning about the coding and refactoring cycle during the extreme programming days in Karlsruhe, Germany where I used to study.